code: public void addListener(ILabelProviderListener listener)
  	{
  		if (fLabelDecorators != null)
  		{
  			for (int i = 0; i < fLabelDecorators.size(); i++)
  			{
  				ILabelDecorator decorator = (ILabelDecorator) fLabelDecorators.get(i);
  				decorator.addListener(listener);
  			}
  		}
  		fListeners.add(listener);
  	}
docs: /*
  (non-Javadoc)
  @see IBaseLabelProvider#addListener(ILabelProviderListener)