code: public void setHead(final WComponent head) {
  		DecoratedLabelModel model = getOrCreateComponentModel();
  
  		if (model.head != null) {
  			remove(model.head);
  		}
  
  		model.head = head;
  
  		if (head != null) {
  			add(head);
  		}
  	}
docs: Sets the label head content.
  
  @param head the head content, or null for no content.