You handle this in the AfterChoosing block for the notifier and change screens like any other screen...
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I did it like in the print, it is not workin :/
Right... sorry, glanced too fast over attachment.
You're not asking to make a choice in that dialog box. So The AfterChoosing is never firing. Either do a dialog box with a yes, no answer, or move the open screen to the button click block, under the notifier block.
as Enis said, you have to use a Notifier.ShowChooseDialog
if you only want to display "OK" as button text, just use an empty text block as second button text
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