public Popover(WindowFrame parent, Widget child, Position arrowPosition)
{
this.arrowPosition = arrowPosition;
backend = WidgetRegistry.CreateBackend<IPopoverBackend> (GetType ());
backend.Init ((IWindowFrameBackend) WidgetRegistry.GetBackend (parent),
(IWidgetBackend) WidgetRegistry.GetBackend (child), arrowPosition);
backend.Closed += (sender, e) => {
if (Closed != null)
Closed (this, EventArgs.Empty);
};
}
