Example of a basic TreePanel:
var tree = new Ext.tree.TreePanel({ title: 'Categories' }); var root = new Ext.tree.TreeNode({ text: 'Categories' }); tree.setRootNode(root); root.appendChild(new Ext.tree.TreeNode({text: 'Widgets'})); root.appendChild(new Ext.tree.TreeNode({text: 'Utilities'})); root.appendChild(new Ext.tree.TreeNode({text: 'Toys'}));