Protected Overridable Sub OnSelectedItemChanged( _
   ByVal oldItem As Object, _
   ByVal newItem As Object _
) 

Dim instance As ISHierarchicalSelectionControl
Dim oldItem As Object
Dim newItem As Object
 
instance.OnSelectedItemChanged(oldItem, newItem)

protected virtual void OnSelectedItemChanged( 
   object oldItem,
   object newItem
)

protected procedure OnSelectedItemChanged( 
    oldItem: TObject;
    newItem: TObject
); virtual; 

protected function OnSelectedItemChanged( 
   oldItem : Object,
   newItem : Object
);

protected: virtual void OnSelectedItemChanged( 
   Object* oldItem,
   Object* newItem
) 

protected:
virtual void OnSelectedItemChanged( 
   Object^ oldItem,
   Object^ newItem
)