WPF Popup not causing application to be focused when clicked on
问题 I have a control that is using a popup with some WPF controls inside of it, and StaysOpen="True". The problem is when clicking on the popup when the application doesn't have focus, the application does not receive focus. I've done a bit of research, and it seems like this may be due to the fact that popups are meant to be used for menus, so they don't have all of the proper windows message handlers hooked up. Here is a barebones sample to demoing the problem: <Window x:Class=