add:  treeDiv.previousValue = treeDiv.value;  yuiTree.subscribe("labelClick", ORBEON.xforms.Events.treeLabelClick); 
context:     _tree: function(treeDiv) {        // Save in the control if it allows multiple selection        treeDiv.xformsAllowMultipleSelection = ORBEON.util.Dom.hasClass(treeDiv, "xforms-select");        // Parse data put by the server in the div        var treeString = ORBEON.util.Dom.getStringValue(treeDiv);        treeString = ORBEON.util.String.replace(treeString, "\n", " ");        treeString = ORBEON.util.String.replace(treeString, "\r", " ");        var treeArray = eval(treeString);        ORBEON.util.Dom.setStringValue(treeDiv, "");        treeDiv.value = "";        var yuiTree = new YAHOO.widget.TreeView(treeDiv.id);        ORBEON.xforms.Globals.treeYui[treeDiv.id] = yuiTree;        ORBEON.xforms.Init._initTreeDivFromArray(treeDiv, yuiTree, treeArray);        ORBEON.util.Dom.removeClass(treeDiv, "xforms-initially-hidden");    },
meta: 5390	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5390/a82e4040d02d3ea9c2e5e1311eecda9d9a2c7579/xforms.js/clean/src/resources-packaged/ops/javascript/xforms.js