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Editorial Team
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Asked: 2026-05-22T19:41:41+00:00

In a typical windows app, when a modal dialog appears and we click outside

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In a typical windows app, when a modal dialog appears and we click outside its boundaries it flickers thus indiacting that anything outside these boundaries is forbidden for now.

Is there any event that fires when this happens? I really need this effect so that I can mock this behavior for my WPF pseudo-modal window.

Thx.
Harish

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1 Answer

  1. Editorial Team

    See this SO question and the answer: Prevent WebBrowser control from stealing focus?

    It explains what FlashWindow does in the background. I quote what’s interesting for you:

    Microsoft doesn’t explain in so many
    words what FlashWindow does.
    Unfortunately, it doesn’t send a
    specific message (say WM_FLASH or
    similar), which would’ve made it
    easier to capture and annul this
    behavior. Instead, FlashWindow does
    three things:

    It sets a system timer for the
    flashing intervals It sends a
    WM_NCACTIVATE message for the first
    flash It sends a WM_NCACTIVATE message
    when the timer expires (on receiving
    WM_SYSTIMER)

    So you’ll have to find the window you’re interested in, and try to catch WM_SYSTIMER in the hosting window procedure. It’s a (very old) undocumented Windows message. Value is 0x118. You can also trap WM_NCACTIVATE which may be easier because it’s represented by .NET events (Activated, Deactivate, etc…)

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