context:   onDragGesture: function(aEvent)  {    var target = aEvent.target;    if (target.parentNode == this.mTreeHeadRow) {      var column = target.getAttribute("value");            var idx = this.getColumnIndexFromHeader(target);      if (idx == -1) return;      this.mColumnDragging = idx;            DNDUtils.invokeSession(target, ["TreeTableBuilder/column-remove"], [column]);    }  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/0b2dd2b2d2fd037df917e07645fa019a963332a5/inTreeTableBuilder.js/clean/extensions/inspector/resources/content/jsutil/xul/inTreeTableBuilder.js