Sdl.SDL_Rect r1 = new Sdl.SDL_Rect(0,0,(short)sdlPanel1.Width,(short)sdlPanel1.Height); Sdl.SDL_FillRect(sdlPanel1.m_SdlSurface, ref r1, 0xFF00FF); Sdl.SDL_UpdateRect(sdlPanel1.m_SdlSurface, 0,0, Width, Height); /* Overlay picture */ Sdl.SDL_DisplayYUVOverlay( sdlPanel1.m_SdlOverlay ,ref r1 );