Very big problem with widget and touch.

Development Programming & Scripting Blueprint
1

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.

2

I added the movie :
(mouse - all works great ,
touch - not working)