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Editorial Team
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Asked: 2026-05-25T20:30:38+00:00

I have a Windows application that registers one CALLBACK procedure that handles WM_HELP messages

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I have a Windows application that registers one CALLBACK procedure that handles WM_HELP messages for the dialog, and one CALLBACK procedure that handles WM_LBUTTONUP messages for a custom button.

Now, when the user clicks the “?” button, then clicks the custom button, the help opens up as expected (on mouse down), BUT if the help window is not occluding the button, a WM_LBUTTONUP message is triggered as well for the custom button (on mouse up). This causes the button to trigger when the user was only asking for help.

Is there any way to stop the WM_LBUTTONUP message from being sent if the button press is for help?

EDIT: The custom button is implemented using a STATIC control. I believe this is because it needs to have an image and no border. So, it does not send BN_CLICKED notifications. In fact, it does not seem to trigger WM_COMMAND in the parent at all.

Thanks

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1 Answer

  1. Editorial Team

    Okay, I fixed it by creating the custom button (static control) with the SS_NOTIFY style, then handling the STN_CLICKED notification in the WM_COMMAND message. (SS_NOTIFY causes WM_COMMAND to trigger in the parent when it is clicked.) This does not trigger when using the “?” button. Thanks!

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