Fixes #3950. Revisit v2 Cancelable Event Pattern - was KeyDown and MouseEvent no longer fires for Listbox#3955

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BDisp wants to merge 2 commits intogui-cs:v2_developfrom BDisp:v2_3950_key-mouse-raise-events-fix

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Commits on Mar 3, 2025

Fixes gui-cs#3950 . KeyDown and MouseEvent no longer fires for Listbox
BDisp
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Fixes gui-cs#3956 . MessageBox doesn't return the index of IsDefault button
BDisp
committed