private void initGUI(int size)
{
GUIEnvironment gui = device.GUIEnvironment;
VideoDriver drv = gui.VideoDriver;
gui.Clear();
gui.AddImage(
drv.GetTexture("../../media/lime_logo_alpha.png"),
new Vector2Di(30, 0));
guiWindow = gui.AddWindow(new Recti(20, 120, size + 20 + 20, size + 120 + 20 + 20 + 30), false, "Paint");
guiSize128 = gui.AddButton(new Recti(10, 30, 40, 30 + 20), guiWindow, -1, "128");
guiSize256 = gui.AddButton(new Recti(50, 30, 80, 30 + 20), guiWindow, -1, "256");
guiSize512 = gui.AddButton(new Recti(90, 30, 120, 30 + 20), guiWindow, -1, "512");
guiImage = gui.AddImage(new Recti(10, 30 + 30, size + 10 - 1, size + 30 - 1 + 30), true, guiWindow);
gui.Focus = guiImage;
}