Missing LostKeyboardFocus event in Windows 11

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

---

When the MainWindow's LostKeyboardFocus event is triggered in my WPF (bridge) app, i.e. when the user clicks the mouse outside my app, the MainWindow will be hidden with Hide() in the LostKeyboardFocus handler. If the user clicks the app icon in the taskbar another time, the new app instance sends a message to the already existing MainWindow, whereupon it shows itself again with Show(). The new app instance will then be closed.

Unfortunately, under Windows 11, when the MainWindow is displayed again, the LostKeyboardFocus event is no longer triggered if the user clicks outside the MainWindow. However, under Windows 8.1 and under Windows 10, the LostKeyboardFocus event is triggered. Under Windows 11, only when the user clicks inside the app and then outside the app, the LostKeyboardFocus event is triggered and the MainWindow can be hidden again.

I asked in the developer forum, but there the problem could not be reproduced. [https://docs.microsoft.com/en-us/answers/questions/746213/missing-lostkeyboardfocus-event-in-windows-11.html] ()

Sample project: [https://1drv.ms/u/s!AnJkahC5qjfigQTcZXXX36fj8ah9]()

---

Original Comments

Feedback Bot on 2/28/2022, 10:46 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

---

Original Solutions

(no solutions)

[gurpreet-wpf]

We are not able to open sample project. Please attach the correct link.

[MichaeIDietrich]

For some reason the link behind seems to be broken and is different to the shown text. But you can copy the text manually and paste it into the browser's address bar. It'll redirects to a OneDrive storage.

[lindexi]

@gurpreet-wpf

Please attach the correct link.

MissingLostKeyboardFocus.zip