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Home/ Questions/Q 8280623
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Editorial Team
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Editorial Team
Asked: June 8, 20262026-06-08T09:44:41+00:00 2026-06-08T09:44:41+00:00

I am writing a WPF control which is hosted in an Word VSTO AddIn

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I am writing a WPF control which is hosted in an Word VSTO AddIn (WinForms). Now I have a problem with the mouse click events on a context menu.

If I click on a context menu item on the left half (the part over the WinForms app), the click goes directly to the WinForms app and my context menu does not receive the event.

If I click the right half of the item (part over the WPF form), everything works as expected.

Illustrated the issue

Can someone out there help me solve this issue?

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  1. Editorial Team
    Editorial Team
    2026-06-08T09:44:43+00:00Added an answer on June 8, 2026 at 9:44 am

    After some deep research I stumbled upon the following bug:

    https://web.archive.org/web/20101211205036/http://connect.microsoft.com:80/VisualStudio/feedback/details/432998/excel-2007-vsto-custom-task-pane-with-wpf-context-menu-has-focus-problems

    It’s for Excel 2007, but is still valid for other Office products (2007, 2010). I managed to fix my issue using the method described here:

    https://web.archive.org/web/20151231010333/http://blogs.msdn.com/b/vsod/archive/2009/12/16/excel-2007-wpf-events-are-not-fired-for-items-that-overlap-excel-ui-for-wpf-context-menus.aspx

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