Keep popup within window bounds

Question

I\'m trying to display a popup under a button.

This is what it looks like now :

Answer 1

I fixed it by setting the placement the custom:

And in the constructor of my usercontrol in code behind I added

OptionsMenuPopup.CustomPopupPlacementCallback += (Size popupSize, Size targetSize, Point offset) =>
            new[] { new CustomPopupPlacement() { Point = new Point(targetSize.Width - popupSize.Width, targetSize.Height) } };