title: Select node in treepanel by default
body: <p><strong>I am using extjs 3.4</strong></p>
  <p>I would like to have preselected node when treepanel first loads. In my example this would be second node. Same thing as mouse click on that node - just it happens by default on selected node.
  So, how can I simulate mouse click on second node? (or just make it active item by default)</p>
  <pre><code>Ext.ns('App.Misc.West');
  
  App.Misc.West.View = Ext.extend(Ext.Panel, {
      constructor: function (config) {
          var me = this;
          var cfg = {
              items: [{
                  xtype: 'treepanel',
                  ref: 'treeMisc',
                  id: 'treeMisc',
                  root: new Ext.tree.AsyncTreeNode({
                      expanded: true,
                      text: 'Data tables',
                      children: [{
                          text: 'Books',
                          bookTitle: 'Books',
                          leaf: true
                      }, {
                          text: 'Cars',
                          bookTitle: 'Cars',
                          leaf: true
                      }]
                  }),
                  rootVisible: true
              }]
          };
          Ext.apply(cfg, config);
          App.Misc.West.View.superclass.constructor.call(me, cfg);
      }
  });
  </code></pre>