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Form already displayed; can't show modally (Error 400)

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

You can't use the Show method to display a visible form as modal. This error has the following cause and solution:

  • You tried to use Show, with the styleargument set to 1 - vbModal, on an already visible form.

    Use either the Unload statement or the Hide method on the form before trying to show it as a modal form.

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