Hii,
I have a treepanel.
I want to load all tree items once at a time and initially want to show only first level of tree data.

I used preloadChildren:true config but I could not get a node (under 2. level) by using getNodeById method of treepanel after tree is loadded.

Code:
    var configObj = {
        layout: 'anchor',
        xtype: 'panel',
        style: 'padding:5px;',
        items: [{
            height: 400,
            width: 400,
            xtype: 'treepanel',
            id: 'categoryTree_',
            rootVisible: false,
            root: {
                id: 'rootcategory',
                expanded:false
            },
            loader: new Ext.tree.TreeLoader({
                preloadChildren: true,
                url: 'DummyStoreData.asmx/GetTreeData',
                baseAttrs: { expanded:false},
                listeners: {
                    load: function(cmp, node, response) {
                        if (window.console) {console.log("loadded");} else {alert("loadded");}
                        //afterLoadCategoryTree(node, response);
                    }
                }
            }),
            listeners: {
                checkchange: {
                    fn: function(node, checked) {
                        return;
                    },
                    scope: this
                },
                afterrender: function(cmp) {
                    categoryTree_ = cmp;
                    categoryTree_.getRootNode().expand();
                    //categoryTree_.loader.load(categoryTree_.getRootNode());
                    //if (window.console) {console.log("load tree");} 
                }
            }
        }]
    };
    var mainLayout = new Ext.Viewport(configObj);
I check the Web service, all data is sended to client.

Thanks for your help.