WPF, ‘Object reference not set to an instance of an object’ in Designer

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What Alex says is the way to go. But I think its a little confusing to understand what he is saying.

Assuming you have your project open in Visual Studio, open another Visual Studio instance and select Debug->Attach To Process. In the dialog which opens select

  • XDesProc.exe (which is the XAML UI Designer) for VS2012 and newer or
  • devenv.exe for older VS versions.

Then do “Reload Designer” for the user control and see the output in the second VS instance to check what exactly is the error.

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