You need to inherit the ButtonComponent class and override the OnMouseDown and OnMouseUp methods, then raise some custom events. The following code illustrates a sample implementation of the custom button:

public class MyButton : ButtonComponent
{
	public override void OnMouseDown(PointF point)
	{
		base.OnMouseDown(point);

		if (Down != null)
			Down(this, EventArgs.Empty);
	}

	public override void OnMouseUp(PointF point)
	{
		base.OnMouseUp(point);

		if (Up != null)
			Up(this, EventArgs.Empty);
	}

	public event EventHandler Down;
	public event EventHandler Up;
} 

If you are loading the contents of your composite node through a XmlLoader, the class of the custom button should be resolved automatically. If this is not the case you could supply a custom ITypeResolver object to the XmlLoader.Load method.

Regards,
Meppy