Context

AdmincentralErrorHandler is the errorHandler of ResurfaceUI. Dialogs (as Windows) are attached to ResurfaceUI. When errorHandler is looked up it is taken from the parent - ResurfaceUI. Dialogs are sometimes detached from UI, yet, they may cause an error right afterwards...

Current situation

.. at that point, AdmincentralErrorHandler is unreachable, since ResurfaceUI is not reachable. Errors do not generate pulse messages, so no banner is shown for errors, like in PAGES-370.

Desired situation

Pass AdmincentralErrorHandler as error handler of the dialog's window. This way detached dialogs can still pass errors to AEH, who will generate visible error banners as pulse messages.