Protected Overridable Sub OnHeaderChanged( _
   ByVal oldHeader As Object, _
   ByVal newHeader As Object _
) 

Dim instance As HeaderedItemsControl
Dim oldHeader As Object
Dim newHeader As Object
 
instance.OnHeaderChanged(oldHeader, newHeader)

protected virtual void OnHeaderChanged( 
   object oldHeader,
   object newHeader
)

protected procedure OnHeaderChanged( 
    oldHeader: TObject;
    newHeader: TObject
); virtual; 

protected function OnHeaderChanged( 
   oldHeader : Object,
   newHeader : Object
);

protected: virtual void OnHeaderChanged( 
   Object* oldHeader,
   Object* newHeader
) 

protected:
virtual void OnHeaderChanged( 
   Object^ oldHeader,
   Object^ newHeader
)