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Editorial Team
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Asked: 2026-05-26T17:39:39+00:00

I use DevExpress RibbonControl on VS2010 WPF C# project. I found if RibbonPageGroup in

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I use DevExpress RibbonControl on VS2010 WPF C# project.

I found if RibbonPageGroup in the RibbonControl has IsVisible=false, when RibbonControl click expand after minimize, application crash and throw "NullReferenceException was unhandled" exception.

I tried setting IsVisible to false in XAML, and also in code behind (i.e. turn IsVisible to false during run-time), both produce the same exception. I tried:

  • used try{}..catch{}, but cannot catch any exception
  • had made sure there’re no assembly version conflicts: use only v11.1 DevExpress assemblies
  • clean -> rebuild -> close VS2010 -> open and rebuild again etc.: still same exception
  • If I change IsVisible=false to IsEnable=false instead, then applications runs fine, no exception. Very wierd..

Have someone encounter this problem? Setting Visibility on RibbonControl’s RibbonPageGroup should be very common (e.g. switching between user and administrator mode). Is it a bug or is there a work around?

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1 Answer

  1. Editorial Team

    The behavior you described is a bug. For this reason, the bug report you posted on this subject (B207506) and then closed has been reactivated. As far as I can see, the hot fix is already available.

    P.S. Please use the DevExpress Support Center to ask a questions or report issues, because there is no guarantee of DX involvement when you use the communities, newsgroups or other communication channels.

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