I tried your code, but it doesn't work for me.

I have a specific situation.
There are two windows, application and the camera app
When camera app is closed, the image goes trough processing.
That is where I need the progress dialog, because it takes some time.

The ting is that the process starts right after the camera app is closed. So I get back to the "multitask view" not the actual application. Maybe that is the problem?