In WPf I have an custom DependencyProperty and want to use IDataErrorInfo

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WPF

C#5.0

I have a control that inherits from TextBox with a DependencyProperty called Item that is bound to a property in the ViewModel that implements IDataErrorInfo. Every time the user presses a key in the Text the value creates a new instance of this object (which should trigger the error checking)which includes an IsValid property. Right now the IDataErrorInfo is not being triggered in the ViewModel.