Display UIMenuController in UIBarButton Click
===

I am trying to display a UIMenuController in a Toolbar button. I have the code below but I am unsure as to what should be in the "SetTargetRect" method.

What should I put in the SetTargetRect method to display the Menu?

Is there anything else that is missing from this code?

    ToolbarItems = new UIBarButtonItem[] { 
	new UIBarButtonItem ("Sort", UIBarButtonItemStyle.Bordered, (sender, e) => {
		var menu = UIMenuController.SharedMenuController;
		menu.MenuItems = new UIMenuItem[] {
			new UIMenuItem ("Current", new Selector ("SortRaceEntrants")),
			new UIMenuItem ("Movers", new Selector ("SortRaceEntrants")),
			new UIMenuItem ("Opening", new Selector ("SortRaceEntrants")),
			new UIMenuItem ("Number", new Selector ("SortRaceEntrants"))
		};
		//menu.SetTargetRect ();
		menu.SetMenuVisible (true, true);
	}),
    };