demo.cs:

using Gtk;
using Gtk.Moonlight;

class X {
     static void Main ()
     {
          Application.Init ();
          GtkSilver.Init ();
          Window w = new Window ("Sample XAML Content");
		  w.Resize(800, 600);
          GtkSilver silver = new GtkSilver (800, 600);
		  silver.LoadFile ("test-animation-line.xaml");
          w.Add (silver);
          w.ShowAll ();
          

          Application.Run ();
     }
}


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test-animation-line.xaml:

<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Width="800" Height="600" Name="Canvas">
    <Canvas.Children>
        <VisualCollection>
            <Ellipse Canvas.Left="186" Canvas.Top="68" Width="96" Height="96" Name="Ellipse">
                <Ellipse.Stroke>
                    <SolidColorBrush Color="#FF000000" Name="SolidColorBrush" />
                </Ellipse.Stroke>
            </Ellipse>
        </VisualCollection>
    </Canvas.Children>
    <Canvas.Resources>
        <ResourceDictionary>
            <Storyboard Name="Storyboard" />
        </ResourceDictionary>
    </Canvas.Resources>
</Canvas>



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compiled with:
gmcs demo.cs -pkg:gtksilver -pkg:gtk-sharp-2.0
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