/// <summary>
/// Called when the mouse button is pressed.
/// </summary>
/// <param name="e">An instance that contains the event data.</param>
/// <returns><c>true</c> if the event was handled.</returns>
protected override bool OnButtonPressEvent(EventButton e)
{
this.GrabFocus();
return this.ActualController.HandleMouseDown(this, e.ToMouseDownEventArgs());
}