Assert.isLegal( handle instanceof ReportItemHandle || handle instanceof GroupHandle );
	public static Iterator getBindingColumnIterator( DesignElementHandle handle )	{		Assert.isLegal( handle instanceof ReportItemHandle				|| handle instanceof GroupHandle );		if ( handle instanceof GroupHandle )		{			return ( (GroupHandle) handle ).columnBindingsIterator( );		}		return ( (ReportItemHandle) handle ).columnBindingsIterator( );	}