window/dialog focus

I am developing a touch screen EPOS application using gtk. When I raise
another window/dialog I would like that item to be highlighed. The focus, as
I call it, remains where the button was pressed and the new item is bordered
in lowlight until an item is selected on it, by which time it's too late.
Can I force this situation, so that the new item essentailly 'gets the users
Hope this is clear.

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