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Getting the Popup to Close When It Loses Focus

On a recent project, I spent (I kid you not) over three hours trying to get a stinking popup to close when I clicked somewhere else in the application.

 Figuring it was a focus issue, I tried the following triggers:

  • IsFocused
  • IsKeyboardFocused
  • IsKeyboardFocusWithin
  • IsMouseCapture
  • IsMouseCaptureWithin

All to no avail.

Turns out that the only thing I had to do was set the StaysOpen property of the Popup thus:

<Popup StaysOpen=”False>

Handy little property. I just wish that it was the default.