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I am creating custom controls and when I inherit from any annotation class (not AnnotationBase), public override void OnApplyTemplate() is called but any this.Template.FindName always returns null. If I inherit directly from ContentControl everything works correctly. I have tried inheriting from CustomAnnotation, BoxAnnotation, AnchorPointAnnotation and several others, all give the same result. I have checked the annotation classes and they all eventually inherit from ContentControl.

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