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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T18:56:47+00:00 2026-05-16T18:56:47+00:00

In my custom control, I override OnKeyUp event handler. When I press Ctrl key

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In my custom control, I override OnKeyUp event handler.

When I press Ctrl key only, then lease it, the keyUp event fired, it’s ok.

When I press Shift key only, then lease it, the keyUp event fired, it’s ok.

But when I press both Ctr+Shift keys, then lease one by one, for example, holding Ctrl+shift first, then release Shift key while still holding the Ctrl or vice versa.

–> KeyUp never raise??? even I release ctrl after that, no keyUp raised also.

Please help.

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  1. Editorial Team
    Editorial Team
    2026-05-16T18:56:47+00:00Added an answer on May 16, 2026 at 6:56 pm

    Because other program accessed at lower level hook and prevent event to fire

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