Terminate processing Callback

[RenSword]

Is there anyway to terminate a processing Callback(or async event) on a TIWAppForm? My callback function takes a long time to finish, I can't navigate to other page when the callback is still running.
the below sample simulate that I can't leave the page until Callback is done processing.

  IWTerminateCallback.zip (Size: 8.19 KB / Downloads: 3)

Intraweb version: 15.4
Delphi version: 11.3

Thanks