appmgr_focus does not show the app

I've written a prio-based application manager.
The application with the highest priority is focused with appmgr_focus.

However, when I call appmgr_focus, the application is not displayed.
Instead, the latest application that was registered is still shown.

Is there some way to change the currently displayed application, and force the 
focused application to be shown?

Regards,

Pieter



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