gistfile1.cs

Gui = new GuiManager(Game.Graphics, Game.Input)
{
    Screen = new Screen(game.GraphicsDevice.Viewport.Width, game.GraphicsDevice.Viewport.Height)
};

Gui.Screen.Desktop.Bounds = new UniRectangle(
    25, 25,
    new UniScalar(1.0f, -25.0F), new UniScalar(1.0f, -25.0F)
);

Gui.Initialize();
Gui.Visualizer = FlatGuiVisualizer.FromFile(game.Services, "Content/menu_gui.xml");

// add the FlatImageButtonControlRenderer to the list of renderers
((FlatGuiVisualizer)Gui.Visualizer).RendererRepository.AddAssembly(typeof(FlatImageButtonControlRenderer).Assembly);

Gui.UpdateOrder = 1000;

Components = new GameComponentCollection { Gui };