/// <summary>
/// Sets the render function.
/// </summary>
public void SetRenderFunction(Action <XGraphics> renderFunction)
{
if (canvas.Children.Count > 0)
{
canvas.Children.Clear();
}
XGraphics gfx = XGraphics.FromCanvas(canvas, new XSize(100, 100), XGraphicsUnit.Presentation);
renderFunction(gfx);
gfx.Dispose(); // necessary in WPF
}