rem: canMoveDown:      function canMoveDown() { return false; }, 
add: optgroupObject.prototype.canMoveDown = function canMoveDown() { return gDialog.lastChild() > treeSelection.currentIndex; } 
context:     canMoveDown:      function canMoveDown()    {      return false;    },
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/55a5e5ddbf4a7e9103b995d808c4466085d2123f/EdSelectProps.js/clean/editor/ui/dialogs/content/EdSelectProps.js