I\'ve WPF application which has one Main window on which I\'m opening a Popup window. The problem I\'m facing is the Popup window always stays on top. If I open some other a
Create your PopUp window modal to the parent control only, as demonstrated by Billy Holli and Brad Leach. That way it will stay on top of the application/window which opened the popup control, but will not stay on top of other windows/applications any longer.