diff --git a/examples/component/CMakeLists.txt b/examples/component/CMakeLists.txt
index 5c05f26..91f3e0e 100644
--- a/examples/component/CMakeLists.txt
+++ b/examples/component/CMakeLists.txt
@@ -16,3 +16,4 @@ example(radiobox_in_frame)
 example(tab_horizontal)
 example(tab_vertical)
 example(toggle)
+example(homescreen)
diff --git a/examples/component/homescreen.cpp b/examples/component/homescreen.cpp
new file mode 100644
index 0000000..af0f23e
--- /dev/null
+++ b/examples/component/homescreen.cpp
@@ -0,0 +1,244 @@
+#include <cmath>
+#include <thread>
+#include "ftxui/component/checkbox.hpp"
+#include "ftxui/component/container.hpp"
+#include "ftxui/component/input.hpp"
+#include "ftxui/component/menu.hpp"
+#include "ftxui/component/radiobox.hpp"
+#include "ftxui/component/screen_interactive.hpp"
+#include "ftxui/component/toggle.hpp"
+#include "ftxui/screen/string.hpp"
+
+using namespace ftxui;
+
+int shift = 0;
+class Graph {
+ public:
+  std::vector<int> operator()(int width, int height) {
+    std::vector<int> output(width);
+    for (int i = 0; i < width; ++i) {
+      float v = 0;
+      v += 0.1 * sin((i + shift) * 0.1);
+      v += 0.2 * sin((i + shift+10) * 0.15);
+      v += 0.1 * sin((i + shift) * 0.03);
+      v *= height;
+      v += 0.5 * height;
+      output[i] = v;
+    }
+    return output;
+  }
+};
+
+class HTopComponent : public Component {
+  Graph my_graph;
+
+ public:
+  HTopComponent() {}
+  ~HTopComponent() override {}
+
+  Element Render() override {
+    return
+      vbox(
+        text(L"Frequency [Mhz]") | hcenter,
+        hbox(
+          vbox(
+            text(L"2400 "), filler(),
+            text(L"1200 "), filler(),
+            text(L"0% ")
+          ),
+          graph(std::ref(my_graph))
+        ) | flex,
+        separator(),
+        text(L"Utilization [%]") | hcenter,
+        hbox(
+          vbox(
+            text(L"100 "), filler(),
+            text(L"50 "), filler(),
+            text(L"0 ")
+          ),
+          graph(std::ref(my_graph)) | color(Color::RedLight)
+        ) | flex,
+        separator(),
+        text(L"Ram [Go]") | hcenter,
+        hbox(
+          vbox(
+            text(L"8192"), filler(),
+            text(L"4096 "), filler(),
+            text(L"0 ")
+          ),
+          graph(std::ref(my_graph)) | color(Color::BlueLight)
+        ) | flex
+      ) | border;
+  }
+};
+
+class CompilerComponent : public Component {
+  Container container = Container::Horizontal();
+    RadioBox compiler;
+    Container flag = Container::Vertical();
+      CheckBox flag_checkbox[4];
+    Container subcontainer = Container::Vertical();
+      Container input_container = Container::Horizontal();
+        Input input_add;
+        Menu input;
+      Input executable;
+
+ public:
+  ~CompilerComponent() override {}
+  CompilerComponent() {
+    Add(&container);
+
+    // Compiler ----------------------------------------------------------------
+    compiler.entries = {
+      L"gcc",
+      L"clang",
+      L"emcc",
+      L"game_maker"
+    };
+    container.Add(&compiler);
+
+    // Flags    ----------------------------------------------------------------
+    container.Add(&flag);
+    flag_checkbox[0].label = L"-Wall";
+    flag_checkbox[1].label = L"-Werror";
+    flag_checkbox[2].label = L"-lpthread";
+    flag_checkbox[3].label = L"-O3";
+    for(auto& c : flag_checkbox)
+      flag.Add(&c);
+
+    container.Add(&subcontainer);
+    // Executable    ----------------------------------------------------------------
+    executable.placeholder = L"executable";
+    subcontainer.Add(&executable);
+
+    // Input    ----------------------------------------------------------------
+    subcontainer.Add(&input_container);
+
+    input_add.placeholder = L"input files";
+    input_add.on_enter = [this] {
+      input.entries.push_back(input_add.content);
+      input_add.content = L"";
+    };
+    input_container.Add(&input_add);
+    input_container.Add(&input);
+  }
+
+  Element Render() override {
+    return
+      vbox(
+        hbox(
+          window(text(L"Compiler"), compiler.Render()),
+          window(text(L"Flags"), flag.Render()),
+          vbox(
+            window(text(L"Executable:"), executable.Render())
+              | size(WIDTH, EQUAL, 20),
+            window(text(L"Input"),
+              hbox(
+                vbox(
+                  hbox(text(L"Add: "), input_add.Render())
+                    | size(WIDTH, EQUAL, 20)
+                    | size(HEIGHT, EQUAL, 1),
+                  filler()
+                ),
+                separator(),
+                input.Render() | frame | size(HEIGHT, EQUAL, 3) | flex
+              )
+            ) | size(WIDTH, EQUAL, 60)
+          ),
+          filler()
+        ),
+        hflow(RenderCommandLine())
+      ) | border;
+  }
+
+  Elements RenderCommandLine() {
+    Elements line;
+    // Compiler
+    line.push_back(text(compiler.entries[compiler.selected]) | bold);
+    // flags
+    for(auto& it : flag_checkbox) {
+      if (it.state) {
+        line.push_back(text(L" "));
+        line.push_back(text(it.label) | dim);
+      }
+    }
+    // Executable
+    if (!executable.content.empty()) {
+      line.push_back(text(L" -O ") | bold);
+      line.push_back(text(executable.content) | color(Color::BlueLight) | bold);
+    }
+    // Input
+    for(auto& it : input.entries) {
+      line.push_back(text(L" " + it) | color(Color::RedLight));
+    }
+    return line;
+  }
+};
+
+class SpinnerComponent : public Component {
+  Element Render() override {
+    Elements entries;
+    for(int i = 0; i<22; ++i) {
+      if (i != 0)
+      entries.push_back(
+        spinner(i, shift/2)
+          | bold
+          | size(WIDTH, GREATER_THAN, 2)
+          | border
+      );
+    }
+    return hflow(std::move(entries)) | border;
+  }
+};
+
+class Tab : public Component {
+  public:
+    Container main_container = Container::Vertical();
+
+    Toggle tab_selection;
+    Container container = Container::Tab(&tab_selection.selected);
+
+    HTopComponent htop;
+    CompilerComponent compiler;
+    SpinnerComponent spinner_component;
+
+    Tab() {
+      Add(&main_container);
+      main_container.Add(&tab_selection);
+      tab_selection.entries = {
+        L"compiler",
+        L"htop",
+        L"spinner"
+      };
+      main_container.Add(&container);
+      container.Add(&compiler);
+      container.Add(&htop);
+      container.Add(&spinner_component);
+    }
+
+    Element Render() override {
+      return vbox(
+        text(L"FTXUI Demo") | bold | hcenter,
+        tab_selection.Render() | hcenter,
+        container.Render()
+      );
+    }
+};
+
+int main(int argc, const char* argv[]) {
+  auto screen = ScreenInteractive::Fullscreen();
+
+  std::thread update([&screen]() {
+    for (;;) {
+      using namespace std::chrono_literals;
+      std::this_thread::sleep_for(0.05s);
+      shift++;
+      screen.PostEvent(Event::Custom);
+    }
+  });
+
+  Tab tab;
+  screen.Loop(&tab);
+
+  return 0;
+}
diff --git a/examples/dom/graph.cpp b/examples/dom/graph.cpp
index e600cf8..576e19f 100644
--- a/examples/dom/graph.cpp
+++ b/examples/dom/graph.cpp
@@ -1,13 +1,12 @@
-#include "ftxui/dom/elements.hpp"
-#include "ftxui/dom/graph.hpp"
-#include "ftxui/screen/screen.hpp"
-#include "ftxui/screen/string.hpp"
 #include <chrono>
 #include <cmath>
 #include <iostream>
 #include <thread>
+#include "ftxui/dom/elements.hpp"
+#include "ftxui/screen/screen.hpp"
+#include "ftxui/screen/string.hpp"
 
-class Graph : public ftxui::GraphFunction {
+class Graph {
  public:
   std::vector<int> operator()(int width, int height) {
     std::vector<int> output(width);
@@ -16,8 +15,6 @@ class Graph : public ftxui::GraphFunction {
       v += 0.1 * sin((i + shift) * 0.1);
       v += 0.2 * sin((i + shift+10) * 0.15);
       v += 0.1 * sin((i + shift) * 0.03);
-      // v += 0.2*sin((i+shift)*0.3);
-      // v += 0.1*sin((i+shift)*0.9);
       v *= height;
       v += 0.5 * height;
       output[i] = v;
@@ -27,6 +24,14 @@ class Graph : public ftxui::GraphFunction {
   int shift = 0;
 };
 
+std::vector<int> triangle(int width, int height) {
+  std::vector<int> output(width);
+  for (int i = 0; i < width; ++i) {
+    output[i] = i % (height - 4) + 2;
+  }
+  return output;
+}
+
 int main(int argc, const char* argv[]) {
   using namespace ftxui;
   using namespace std::chrono_literals;
@@ -36,20 +41,20 @@ int main(int argc, const char* argv[]) {
   std::string reset_position;
   for (int i = 0;; ++i) {
     auto document =
-      window(text(L"Your graphs"),
-        hbox(
-          vbox(
-            graph(my_graph), separator(),
-            graph(my_graph) | inverted
-          ) | flex,
-          separator(),
-          vbox(
-            graph(my_graph) | color(Color::BlueLight), separator(),
-            graph(my_graph) | color(Color::RedLight), separator(),
-            graph(my_graph) | color(Color::YellowLight)
-          ) | flex
-        )
-      ) | size(HEIGHT, GREATER_THAN, 40);
+      hbox(
+        vbox(
+          graph(std::ref(my_graph)), separator(),
+          graph(triangle) | inverted
+        ) | flex,
+        separator(),
+        vbox(
+          graph(std::ref(my_graph)) | color(Color::BlueLight), separator(),
+          graph(std::ref(my_graph)) | color(Color::RedLight), separator(),
+          graph(std::ref(my_graph)) | color(Color::YellowLight)
+        ) | flex
+      )
+      | border
+      | size(HEIGHT, GREATER_THAN, 40);
 
     auto screen = Screen::Create(Dimension::Full(), Dimension::Fit(document));
     Render(screen, document.get());
diff --git a/ftxui/CMakeLists.txt b/ftxui/CMakeLists.txt
index c5451b0..bdbe098 100644
--- a/ftxui/CMakeLists.txt
+++ b/ftxui/CMakeLists.txt
@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.0)
+find_package(Threads)
 
 add_library(screen
   src/ftxui/screen/box.cpp
@@ -48,7 +49,7 @@ add_library(component
 
 target_link_libraries(dom PUBLIC screen)
 target_link_libraries(component PUBLIC dom)
-
+target_link_libraries(component PUBLIC Threads::Threads)
 
 foreach(lib screen dom component)
   target_include_directories(${lib}
@@ -86,7 +87,6 @@ install(EXPORT ftxui-export
 # Note: For gtest, please follow:
 # https://stackoverflow.com/questions/24295876/cmake-cannot-find-a-googletest-required-library
 find_package(GTest)
-find_package(Threads)
 if (GTEST_FOUND AND THREADS_FOUND)
   add_executable(dom_tests
     src/ftxui/dom/gauge_test.cpp
diff --git a/ftxui/include/ftxui/component/event.hpp b/ftxui/include/ftxui/component/event.hpp
index 724ab73..d9fc17c 100644
--- a/ftxui/include/ftxui/component/event.hpp
+++ b/ftxui/include/ftxui/component/event.hpp
@@ -24,10 +24,14 @@ struct Event{
   static Event Escape;
   static Event F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12;
 
+  // --- Custom ---
+  static Event Custom;
+
   bool operator==(const Event& other) { return values == other.values; }
 
   // Internal representation.
   std::array<int, 5> values = {0, 0, 0, 0, 0};
+  
 };
 
 
diff --git a/ftxui/include/ftxui/component/screen_interactive.hpp b/ftxui/include/ftxui/component/screen_interactive.hpp
index 71cef2c..65f42ba 100644
--- a/ftxui/include/ftxui/component/screen_interactive.hpp
+++ b/ftxui/include/ftxui/component/screen_interactive.hpp
@@ -1,9 +1,15 @@
 #ifndef FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP
 #define FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP
 
-#include "ftxui/screen/screen.hpp"
+#include <condition_variable>
 #include <functional>
 #include <memory>
+#include <mutex>
+#include <queue>
+#include <atomic>
+
+#include "ftxui/component/event.hpp"
+#include "ftxui/screen/screen.hpp"
 
 namespace ftxui {
 class Component;
@@ -19,9 +25,11 @@ class ScreenInteractive : public Screen {
     void Loop(Component*);
     std::function<void()> ExitLoopClosure();
 
+    void PostEvent(Event event);
+
   private:
    void Draw(Component* component);
-   bool quit_ = false;
+   void EventLoop(Component* component);
 
    enum class Dimension {
      FitComponent,
@@ -31,6 +39,11 @@ class ScreenInteractive : public Screen {
    };
    Dimension dimension_ = Dimension::Fixed;
    ScreenInteractive(int dimx, int dimy, Dimension dimension);
+
+   std::condition_variable events_queue_wait;
+   std::mutex events_queue_mutex;
+   std::queue<Event> events_queue;
+   std::atomic<bool> quit_ = false;
 };
 
 }  // namespace ftxui
diff --git a/ftxui/include/ftxui/dom/elements.hpp b/ftxui/include/ftxui/dom/elements.hpp
index 6a92117..60ac38a 100644
--- a/ftxui/include/ftxui/dom/elements.hpp
+++ b/ftxui/include/ftxui/dom/elements.hpp
@@ -3,7 +3,6 @@
 
 #include <functional>
 
-#include "ftxui/dom/graph.hpp"
 #include "ftxui/dom/node.hpp"
 #include "ftxui/screen/color.hpp"
 
@@ -12,16 +11,19 @@ namespace ftxui {
 using Element = std::unique_ptr<Node>;
 using Elements = std::vector<Element>;
 using Decorator = std::function<Element(Element)>;
+using GraphFunction = std::function<std::vector<int>(int,int)>;
 
 // --- Widget ---
 Element text(std::wstring text);
 Element separator();
+Element separator(Pixel);
 Element gauge(float ratio);
 Element border(Element);
+Decorator borderWith(Pixel);
 Element window(Element title, Element content);
 Element spinner(int charset_index, size_t image_index);
 Elements paragraph(std::wstring text); // Use inside hflow(). Split by space.
-Element graph(GraphFunction&); // See graph.hpp
+Element graph(GraphFunction);
 
 // -- Decorator ---
 Element bold(Element);
@@ -46,6 +48,7 @@ Element hflow(Elements);
 // container.
 Element filler();
 Element flex(Element);
+Element notflex(Element);
 
 // -- Size override;
 enum Direction { WIDTH, HEIGHT };
diff --git a/ftxui/include/ftxui/dom/graph.hpp b/ftxui/include/ftxui/dom/graph.hpp
deleted file mode 100644
index 4f7a471..0000000
--- a/ftxui/include/ftxui/dom/graph.hpp
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef FTXUI_DOM_GRAPH_HPP
-#define FTXUI_DOM_GRAPH_HPP
-
-#include "ftxui/dom/elements.hpp"
-
-namespace ftxui {
-
-class GraphFunction {
- public:
-  virtual std::vector<int> operator()(int width, int height) = 0;
-};
-
-} // namespace ftxui
-
-#endif /* end of include guard: FTXUI_DOM_GRAPH_HPP */
diff --git a/ftxui/src/ftxui/component/event.cpp b/ftxui/src/ftxui/component/event.cpp
index 85c8054..0e1ca03 100644
--- a/ftxui/src/ftxui/component/event.cpp
+++ b/ftxui/src/ftxui/component/event.cpp
@@ -34,4 +34,6 @@ Event Event::F10{ESC, '[', '2', '1', '~'};
 Event Event::F11{ESC, '[', '2', '1', '~'};  // Same as F10 ?
 Event Event::F12{ESC, '[', '2', '4', '~'};
 
+Event Event::Custom{0, 0, 0, 0, 0};
+
 } // namespace ftxui
diff --git a/ftxui/src/ftxui/component/input.cpp b/ftxui/src/ftxui/component/input.cpp
index 20f41a1..0f9ae96 100644
--- a/ftxui/src/ftxui/component/input.cpp
+++ b/ftxui/src/ftxui/component/input.cpp
@@ -5,19 +5,21 @@ namespace ftxui {
 
 // Component implementation.
 Element Input::Render() {
+  cursor_position = std::max(0, std::min<int>(content.size(), cursor_position));
+  auto main_decorator = flex | size(HEIGHT, EQUAL, 1);
   bool is_focused = Focused();
 
   // Placeholder.
   if (content.size() == 0) {
     if (is_focused)
-      return text(placeholder) | dim | inverted | flex;
+      return text(placeholder) | dim | inverted | main_decorator;
     else
-      return text(placeholder) | dim | flex;
+      return text(placeholder) | dim | main_decorator;
   }
 
   // Not focused.
   if (!is_focused)
-    return text(content) | flex;
+    return text(content) | main_decorator;
 
   std::wstring part_before_cursor = content.substr(0,cursor_position);
   std::wstring part_at_cursor = cursor_position < (int)content.size()
@@ -34,9 +36,11 @@ Element Input::Render() {
       text(part_before_cursor),
       text(part_at_cursor) | underlined | focused,
       text(part_after_cursor)
-    ) | flex | inverted | frame;
+    ) | flex | inverted | frame | main_decorator;
+    
 }
 bool Input::OnEvent(Event event) {
+  cursor_position = std::max(0, std::min<int>(content.size(), cursor_position));
   std::wstring c;
 
   // Backspace.
@@ -50,9 +54,14 @@ bool Input::OnEvent(Event event) {
 
   // Enter.
   if (event == Event::Return) {
+    on_enter();
     return true;
   }
 
+  if (event == Event::Custom) {
+    return false;
+  }
+
   if (event == Event::ArrowLeft && cursor_position > 0) {
     cursor_position--;
     return true;
diff --git a/ftxui/src/ftxui/component/screen_interactive.cpp b/ftxui/src/ftxui/component/screen_interactive.cpp
index 459a06c..d883d15 100644
--- a/ftxui/src/ftxui/component/screen_interactive.cpp
+++ b/ftxui/src/ftxui/component/screen_interactive.cpp
@@ -6,6 +6,7 @@
 #include <iostream>
 #include "ftxui/component/component.hpp"
 #include "ftxui/screen/terminal.hpp"
+#include <thread>
 
 namespace ftxui {
 
@@ -70,6 +71,28 @@ ScreenInteractive ScreenInteractive::FitComponent() {
   return ScreenInteractive(0, 0, Dimension::FitComponent);
 }
 
+void ScreenInteractive::PostEvent(Event event) { 
+  std::unique_lock<std::mutex> lock(events_queue_mutex);
+  events_queue.push(event);
+  events_queue_wait.notify_one();
+}
+
+void ScreenInteractive::EventLoop(Component* component) {
+  bool handled = 0;
+  for (;;) {
+    std::unique_lock<std::mutex> lock(events_queue_mutex);
+    while (!events_queue.empty()) {
+      component->OnEvent(events_queue.front());
+      events_queue.pop();
+      handled = true;
+    }
+
+    if (handled)
+      return;
+    events_queue_wait.wait(lock);
+  }
+}
+
 void ScreenInteractive::Loop(Component* component) {
   //std::cout << "\033[?9h";    [> Send Mouse Row & Column on Button Press <]
   //std::cout << "\033[?1000h"; [> Send Mouse X & Y on button press and release <]
@@ -89,18 +112,25 @@ void ScreenInteractive::Loop(Component* component) {
   terminal_configuration_new.c_lflag &= ~ECHO;
   tcsetattr(STDIN_FILENO, TCSANOW, &terminal_configuration_new);
 
+  std::thread read_char([this]() {
+    while (!quit_)
+      PostEvent(GetEvent());
+  });
+
   std::string reset_position;
   while (!quit_) {
     reset_position = ResetPosition();
     Draw(component);
     std::cout << reset_position << ToString() << std::flush;
     Clear();
-    component->OnEvent(GetEvent());
+    EventLoop(component);
   }
 
   // Restore the old terminal configuration.
   tcsetattr(STDIN_FILENO, TCSANOW, &terminal_configuration_old);
 
+  read_char.join();
+
   std::cout << std::endl;
 }
 
diff --git a/ftxui/src/ftxui/dom/border.cpp b/ftxui/src/ftxui/dom/border.cpp
index eca5c75..90bf0c2 100644
--- a/ftxui/src/ftxui/dom/border.cpp
+++ b/ftxui/src/ftxui/dom/border.cpp
@@ -5,13 +5,21 @@ namespace ftxui {
 
 using namespace ftxui;
 
-static wchar_t charset[] = L"┌┐└┘─│┬┴┤├";
+static wchar_t simple_border_charset[] = L"┌┐└┘─│┬┴┤├";
 
 class Border : public Node {
  public:
-  Border(Elements children) : Node(std::move(children)) {}
+  Border(Elements children)
+      : Node(std::move(children)),
+        charset(std::begin(simple_border_charset),
+                std::end(simple_border_charset)) {}
+  Border(Elements children, Pixel pixel)
+      : Node(std::move(children)), charset_pixel(10, pixel) {}
   ~Border() override {}
 
+  std::vector<Pixel> charset_pixel; 
+  std::vector<wchar_t> charset;
+
   void ComputeRequirement() override {
     Node::ComputeRequirement();
     requirement_ = children[0]->requirement();
@@ -52,6 +60,13 @@ class Border : public Node {
     if (box_.x_min >= box_.x_max || box_.y_min >= box_.y_max)
       return;
 
+    if (!charset.empty())
+      RenderPixel(screen);
+    else
+      RenderChar(screen);
+  }
+
+  void RenderPixel(Screen& screen) {
     screen.at(box_.x_min, box_.y_min) = charset[0];
     screen.at(box_.x_max, box_.y_min) = charset[1];
     screen.at(box_.x_min, box_.y_max) = charset[2];
@@ -69,6 +84,21 @@ class Border : public Node {
     if (children.size() == 2)
       children[1]->Render(screen);
   }
+
+  void RenderChar(Screen& screen) {
+    screen.PixelAt(box_.x_min, box_.y_min) = charset_pixel[0];
+    screen.PixelAt(box_.x_max, box_.y_min) = charset_pixel[1];
+    screen.PixelAt(box_.x_min, box_.y_max) = charset_pixel[2];
+    screen.PixelAt(box_.x_max, box_.y_max) = charset_pixel[3];
+    for(float x = box_.x_min + 1; x<box_.x_max; ++x) {
+      screen.PixelAt(x, box_.y_min) = charset_pixel[4];
+      screen.PixelAt(x, box_.y_max) = charset_pixel[4];
+    }
+    for(float y = box_.y_min + 1; y<box_.y_max; ++y) {
+      screen.PixelAt(box_.x_min, y) = charset_pixel[5];
+      screen.PixelAt(box_.x_max,y) = charset_pixel[5];
+    }
+  }
 };
 
 std::unique_ptr<Node> border(Element child) {
@@ -79,9 +109,9 @@ std::unique_ptr<Node> window(Element title, Element content) {
   return std::make_unique<Border>(unpack(std::move(content), std::move(title)));
 }
 
-Decorator boxed() {
-  return [](Element child) {
-    return border(std::move(child));
+Decorator borderWith(Pixel pixel) {
+  return [pixel](Element child) {
+    return std::make_unique<Border>(unpack(std::move(child)), pixel);
   };
 }
 
diff --git a/ftxui/src/ftxui/dom/flex.cpp b/ftxui/src/ftxui/dom/flex.cpp
index f4945b9..d25f4d3 100644
--- a/ftxui/src/ftxui/dom/flex.cpp
+++ b/ftxui/src/ftxui/dom/flex.cpp
@@ -8,7 +8,7 @@ class Flex : public Node {
   Flex() {}
   Flex(Element child) : Node(unpack(std::move(child))) {}
   ~Flex() override {}
-  void ComputeRequirement() {
+  void ComputeRequirement() override {
     requirement_.min.x = 0;
     requirement_.min.y = 0;
     if (!children.empty()) {
@@ -26,6 +26,23 @@ class Flex : public Node {
   }
 };
 
+class NotFlex : public Flex {
+ public:
+  NotFlex() {}
+  NotFlex(Element child) : Flex(std::move(child)) {}
+  ~NotFlex() override {}
+  void ComputeRequirement() override {
+    requirement_.min.x = 0;
+    requirement_.min.y = 0;
+    if (!children.empty()) {
+      children[0]->ComputeRequirement();
+      requirement_ = children[0]->requirement();
+    }
+    requirement_.flex.x = 0;
+    requirement_.flex.y = 0;
+  }
+};
+
 std::unique_ptr<Node> filler() {
   return std::make_unique<Flex>();
 }
@@ -34,4 +51,8 @@ std::unique_ptr<Node> flex(Element child) {
   return std::make_unique<Flex>(std::move(child));
 }
 
+std::unique_ptr<Node> notflex(Element child) {
+  return std::make_unique<NotFlex>(std::move(child));
+}
+
 };  // namespace ftxui
diff --git a/ftxui/src/ftxui/dom/graph.cpp b/ftxui/src/ftxui/dom/graph.cpp
index 0e8b766..efe8555 100644
--- a/ftxui/src/ftxui/dom/graph.cpp
+++ b/ftxui/src/ftxui/dom/graph.cpp
@@ -6,7 +6,7 @@ const wchar_t charset[] = L" ▗▐▖▄▟▌▙█";
 
 class Graph : public Node {
  public:
-  Graph(GraphFunction& graph_function) : graph_function_(graph_function) {}
+  Graph(GraphFunction graph_function) : graph_function_(graph_function) {}
   ~Graph() override {}
 
   void ComputeRequirement() override {
@@ -35,10 +35,10 @@ class Graph : public Node {
   }
 
  private:
-  GraphFunction& graph_function_;
+  GraphFunction graph_function_;
 };
 
-std::unique_ptr<Node> graph(GraphFunction& graph_function) {
+std::unique_ptr<Node> graph(GraphFunction graph_function) {
   return std::make_unique<Graph>(graph_function);
 }
 
diff --git a/ftxui/src/ftxui/dom/separator.cpp b/ftxui/src/ftxui/dom/separator.cpp
index b66b905..a59fbea 100644
--- a/ftxui/src/ftxui/dom/separator.cpp
+++ b/ftxui/src/ftxui/dom/separator.cpp
@@ -23,16 +23,34 @@ class Separator : public Node {
     else
       c = U'│';
 
+    Pixel p;
+    p.character = c;
+    RenderWithPixel(screen, p);
+  }
+
+  void RenderWithPixel(Screen& screen, Pixel pixel) {
     for (int y = box_.y_min; y <= box_.y_max; ++y) {
       for (int x = box_.x_min; x <= box_.x_max; ++x) {
-        screen.at(x, y) = c;
+        screen.PixelAt(x, y) = pixel;
       }
     }
   }
 };
 
+class SeparatorWithPixel : public Separator {
+ public:
+  SeparatorWithPixel(Pixel p) : p(p) {}
+  ~SeparatorWithPixel() override {}
+  void Render(Screen& screen) override { RenderWithPixel(screen, p); }
+  Pixel p;
+};
+
 std::unique_ptr<Node> separator() {
   return std::make_unique<Separator>();
 }
 
+std::unique_ptr<Node> separator(Pixel pixel) {
+  return std::make_unique<SeparatorWithPixel>(pixel);
+}
+
 };  // namespace ftxui