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Windowless controls can't have menus.

office 365 dev account|Last Updated: 6/12/2017
1 Contributor

This error has the following causes and solutions:

  • You've attempted to place a menu on a windowless control, which is not allowed. To place a menu on a control, choose a windowed control.

For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).

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