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Very big problem with widget and touch.

Hello, I have a critical problem.
I’m designing a game for windows 7 and windows 10 for touch screens. I did a widget with ComboBox (string).
I can not select any option because the list with them disappears immediately. Please help.

I added the movie :
(mouse - all works great ,
touch - not working)
https://youtube.com/watch?v=saOiv0Cm9QM