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Editorial Team
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Asked: 2026-05-25T14:04:38+00:00

Inside a MFC dialog, I have 2 overlapping rows of text boxes (what user

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Inside a MFC dialog, I have 2 overlapping rows of text boxes (what user can see is only one row). when I clicked a button, i shifted down the row at bottom, so now user can see both rows.

The problem is if I have some data loaded in DoDataExchange() for the text boxes, I wouldn’t be able to see them showing when the dialog boots up. But when I click inside the text box, the data shows.

I want to know what exactly happen when I clicked a UI? What drawing functions are invoked at backgrounds? So I can fix my problem.

Thank you.
ZQ

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1 Answer

  1. Editorial Team

    Nothing is drawn when you click, maybe you are seeing an Invalidate() being triggered for some reason that redraws the text boxes. Or maybe the parent control (dialog, I assume) doesn’t have WS_CLIPCHILDREN set, or some other funny things are happening with the WS_CLIPXXX flags (they’re somewhat of a black art).

    More to the point, use Spy++ to check what ‘happens’ when you click – i.e. the messages that are posted at each point in time.

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