Protected Overridable Sub OnHeaderTemplateChanged( _
   ByVal oldHeaderTemplate As DataTemplate, _
   ByVal newHeaderTemplate As DataTemplate _
) 

Dim instance As HeaderedItemsControl
Dim oldHeaderTemplate As DataTemplate
Dim newHeaderTemplate As DataTemplate
 
instance.OnHeaderTemplateChanged(oldHeaderTemplate, newHeaderTemplate)

protected virtual void OnHeaderTemplateChanged( 
   DataTemplate oldHeaderTemplate,
   DataTemplate newHeaderTemplate
)

protected procedure OnHeaderTemplateChanged( 
    oldHeaderTemplate: DataTemplate;
    newHeaderTemplate: DataTemplate
); virtual; 

protected function OnHeaderTemplateChanged( 
   oldHeaderTemplate : DataTemplate,
   newHeaderTemplate : DataTemplate
);

protected: virtual void OnHeaderTemplateChanged( 
   DataTemplate* oldHeaderTemplate,
   DataTemplate* newHeaderTemplate
) 

protected:
virtual void OnHeaderTemplateChanged( 
   DataTemplate^ oldHeaderTemplate,
   DataTemplate^ newHeaderTemplate
)