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Is this layout possible? I want to place Custom Ui at the top of the screen and fix it, what should I do?
For example, if you place Customui on top of A ui and click the button, the screen will switch to B ui, but you want to keep Custom ui on top.
I think it will depend upon who is the parent of CustomIU, the top level screen object or one of the A/B UI? If you manage CustomUI as it's own "window" and use some clever signalling then it is doable.