Dynamic Tree in Extjs4.0.2

Tree: Retriving the data from database and showind as a node of tree.

//creating a treePanel.
                    var tree = Ext.create('Ext.tree.Panel',{
                        width:400,
                        id:'Tree_id',
                        height:700,
                        id:'Tree_id',
                        renderTo: Ext.getBody()
                         //listeners:{'click':function(node,event){alert('hi');}}
                    });
 
                  //root node config..
                    tree.setRootNode({
                        text:'Poll',
                        visible: false
                    });
                    

                    //Return the object of root node of tree.
                    var root = tree.getRootNode();
                   
                     //Append the child on root node.
                    var OpenPoll = root.appendChild({
                            text:'OpenPoll',
                            id: 'OpenPoll_id'
                    });
                    
                    var ClosedPoll = root.appendChild({
                            text:'ClosedPoll',
                            id:'OpenPoll_id'
                    });
                    

                    
                    //on each call this function appaend child on root node
                    function insertNode(rec,root,parent){
                        
                        var tmpCls = 'treeLock';

                        //node text will be shown as FullQuestion on each call this will append as a child of root.
                        parent.appendChild({
                            text:rec.FullQuestion,
                            id:rec.QuestionID,
                            leaf:true
                        });
                        
                    }

                     //this ajax call will request the cfm page and cfm pge respond with data that will append as a child of root.
                    Ext.Ajax.request({
                        url: '../db_query/TreeQuery.cfm',
                        disableCaching: true,
                         //if cfm page respond successfully then the respond data will be read by  Ext.decode function.
                        success: function(response){
                            obj = Ext.decode(response.responseText);
                            if(obj.success){
                              //here rec will contain one row for geting all row Ext.each will fetch all the row sequentially.
                                Ext.each(obj.QuestionInfos,function(rec){
                                    var dt = new Date();
                                    
                                    if(rec.StartDateOfVote != '') {
                                        //alert(rec.EndDateOfVote);
                                        
                                        var TodayDate = Ext.Date.format(dt,'Y-m-d H:i:s');
                                        
                                        if(TodayDate
                                

                                tree.expandAll();
                                });
                            }
                             else {
                                
                                Ext.Msg.alert(response);
                            }
                        },
                        failure: function(response){
                            Ext.Msg.alert(response);
                        }
                    });
 
 
coldfusion page for query will be ....