if ( IGroupElementModel.KEY_EXPR_PROP.equals( propertyName ) )
if ( GroupHandle.KEY_EXPR_PROP.equals( propertyName ) )
	public boolean needRefreshed( NotificationEvent event )	{		if ( event instanceof PropertyEvent )		{			String propertyName = ( (PropertyEvent) event ).getPropertyName( );			if ( IGroupElementModel.KEY_EXPR_PROP.equals( propertyName ) )				return true;		}		return false;	}