WPF Error Styles only being rendered properly on visible tab of a tab control

Question

I have a data object used to contain my UI data that supports INotifyPropertyChanged and IDataErrorInfo. Originally I had all of the UI controls di

Answer 1

Just to add to the answer provided, the error template can be set once in a resource dictionary. Just the triggers have to be copied & pasted for all the default styles of all the relevant element types.

For example:

Or, take it one step further and avoid the trigger repetition by combining the styles: