rem: if( aDataObject.data != undefined ) 
add: if( 'data' in aDataObject ) 
context:     set_Menulist:      function ( aElementID, aDataObject )        {          var element = wsm.contentArea.document.getElementById( aElementID );          // set all generic properties          wsm.generic_Set( element, aDataObject );          // set menulist specific properties          if( aDataObject.data != undefined )            {               element.selectedItem = element.getElementsByAttribute( "data", aDataObject.data )[0];            }        },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/7d4ac1b07cd68f17f9d4cc23fab5b83496fc2271/nsWidgetStateManager.js/buggy/xpfe/global/resources/content/nsWidgetStateManager.js