Question

I have a custom UserControl which tries to recreate auto-complete for a textbox. When user types, the text is used to filter a provided collection of items and then a Popup displays a ListBox with items that match what user have typed.

Unfortunately, if user decides to switch away from the application to another window (browser, MSWord, anything!), the Popup remains on top of every other window!

Also, if I move my window (which hosts the custom control) with the popup open, the popup stays in place (and doesn’t follow the window)! It’s kinda funny but obviously not acceptable behaviour. I’ve looked around but only found one post about this that went unanswered for two years 🙁

Answer 1

Actually, I didn’t realize that I had StaysOpen property of the Popup set to true.

<Popup StaysOpen="False" />

actually does the trick for me.