Thank you for your answer. The suggested solution deals with my problem only partially. Now the confirm dialog is called twice.
Steps to reproduce:
1. Put any text into the combox, press enter or tab and I confirm the confirm dialog [Until now is everything ok]
2. Continue writing text in the combobox (do not remove existing text before), press enter or tab and now appears the confirm dialog twice.
How should this be solved?
Another problem is that if I do the two mentioned steps and confirm the confirm dialog with enter, then no "done" alert shows. Is there any solution to this as well?
Thank you and kind regards