code: private void markComponentForDeletion(String id , UIComponent component)
      {
          _componentsMarkedForDeletion.get(_deletionLevel).put(id, component);
      }
docs: Mark a component to be deleted from the tree. The component to be deleted is addded on the
  current level. This is done from ComponentSupport.markForDeletion
  
  @param id
  @param component the component marked for deletion.