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Asked: 2026-05-25T23:41:32+00:00

I am trying to reference System.Windows.Interactivity in order to support IsExpanded behavior command But

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I am trying to reference System.Windows.Interactivity in order to support IsExpanded behavior command

But as soon as i add a reference to this assembly, i get the error loading System.Windows 2.0. This appears to be a known bug, and solution appears to be to just reference that assembly.

I downloaded Silverlight SDK, and referenced assembly in question in my project.

however, now i am getting lots of conflicts between System.Windows, and WindowsBase.dll. Classes such as RoutedEventHandler exist in both.. Must be a way to fix this, since i see people being successful in using that Interactivity dll with wpf 4.0..

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1 Answer

  1. Editorial Team

    If you have a WPF project you need to use the WPF specific version of that assembly, maybe you took the wrong .dll?

    Here are the two respective file paths on my system:

    C:\Program Files (x86)\Microsoft SDKs\Expression\Blend\.NETFramework\v4.0\Libraries\System.Windows.Interactivity.dll
C:\Program Files (x86)\Microsoft SDKs\Expression\Blend\Silverlight\v4.0\Libraries\System.Windows.Interactivity.dll
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