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How about you pop up a 'no-icon popup' Panel from the first PushButton. Make this panel really small so that it looks like a Message box. Here, add another PushButton with its ActionVerification enabled with the second message. Use this Second PB's value as the final control value.
You'll need to take care of closing this pop-up panel, etc.. which shouldn't be very difficult.
Hope this helps,
Khalid 🙂
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