private void CleanupGraphicsContext()
{
CoordinateSystemMode = default(CoordinateSystemMode);
ScreenWidth = 0;
ScreenHeight = 0;
FrameBufferWidth = 0;
FrameBufferWidthAsSingle = 0f;
FrameBufferHeight = 0;
FrameBufferHeightAsSingle = 0f;
GraphicsContext = null;
}