Holding shift+ctrl then release one each doesn't raise KeyUp event?

Question

Hi,

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.

Answer 1

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