‘Cannot register duplicate name ‘XXX’ in this scope’ in VS 2010

If you have the problem, that Visual Studio 2010 complains ‘Cannot register duplicate name ‘XXX’ in this scope’, check if you have Resources with a x:Name insted of x:Key-Name:

<SolidColorBrush x:Name="NonWorkingResourceName" Color="Red" />
<SolidColorBrush x:Key="WorkingResourceName" Color="Blue" />

Replace x:Name with x:Key and everything is ok.

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