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diff --git a/dev/MinGfx/example/CircleViewer.h b/dev/MinGfx/example/CircleViewer.h
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+++ b/dev/MinGfx/example/CircleViewer.h
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+
+#include <mingfx.h>
+
+
+/** An application that opens up a window that includes a few buttons 
+    for controlling the simulation and can be used to draw circles and 
+    other computer graphics.
+
+    After constructing a new CircleViewer, call Run() to start and
+    run the application.  Run() will not return until the application
+    window is closed.  Make sure that you call cs3081::InitGraphics()
+    before creating the RobotViewer app.  Example:
+
+    ```
+    int main(int argc, char **argv) {
+        cs3081::InitGraphics();
+        cs3081::CircleViewer *app = new cs3081::CircleViewer();
+        app->Run();
+        cs3081::ShutdownGraphics();
+        return 0;
+    }
+    ```
+
+    While the window is open UpdateSimulation() will be called
+    repeatedly, once per frame.  Fill this in to update your simulation
+    or perform any other processing that should happen over time as the
+    simulation progresses.
+
+    Fill in the On*() methods as desired to respond to user input events.
+
+    Fill in the Draw*() methods to draw graphics to the screen using
+    either the nanovg library or raw OpenGL.
+*/
+class CircleViewer : public GraphicsApp {
+public:
+    CircleViewer();
+    ~CircleViewer();
+
+    void InitNanoGUI();
+
+    void UpdateSimulation(double dt);
+
+
+    void OnRestartBtnPressed();
+
+    void OnPauseBtnPressed();
+
+
+    void OnMouseMove(const Point2 &pos, const Vector2 &delta);
+
+    void OnLeftMouseDown(const Point2 &pos);
+    void OnLeftMouseDrag(const Point2 &pos, const Vector2 &delta);
+    void OnLeftMouseUp(const Point2 &pos);
+    
+    void OnRightMouseDown(const Point2 &pos);
+    void OnRightMouseDrag(const Point2 &pos, const Vector2 &delta);
+    void OnRightMouseUp(const Point2 &pos);
+    
+    
+    void OnKeyDown(const char *c, int modifiers);
+
+    void OnKeyUp(const char *c, int modifiers);
+
+    void OnSpecialKeyDown(int key, int scancode, int modifiers);
+
+    void OnSpecialKeyUp(int key, int scancode, int modifiers);
+
+
+    void DrawUsingNanoVG(NVGcontext *ctx);
+
+    void DrawUsingOpenGL();
+
+private:
+    double simTime_;
+    bool paused_;
+    nanogui::Button *pauseBtn_;
+};