Issue with WPF validation(IDataErrorInfo) and tab focusing

Question

I have a TextBox bound to a property of an object which implements IDataErrorInfo. I set up the Validation.ErrorTemplate of the

Answer 1

Tab items tend to mess up with adorners (although I don't know why, I experienced it).

I could reproduce your problem.

Solve it by wrapping the contents of the TabItem with an AdornerDecorator.

So:

    

        

           
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