title: me.dockedItems error in ExtJS
body: <p>I was trying to test out a script i write on firebug console and i think the script is simple enough. And when i ran the script, i got this error me.dockedItems is undefined.
  Here's the code i run from Firefox's firebug console:</p>
  
  <pre><code>Ext.create('Ext.window.Window',{
      title : 'Login',
      width : 400,
      height : 500,
      initComponent : function() {
          var me = this;
  
          var usernameField = Ext.create('Ext.form.field.Text',{
              fieldLabel : 'Net ID',
              allowBlank : false,
              labelWidth : 150,
              width : 150,
              emptyText : 'Net ID'
          });
  
          var passField = Ext.create('Ext.form.field.Text',{
              fieldLabel : 'Password',
              allowBlank : false,
              labelWidth : 150,
              width : 150,
              emptyText : 'Pass'
          });
  
          this.items = [usernameField,passField];
          this.callParent(arguments);
      }
  }).show();
  </code></pre>
  
  <p>I appreciate your help to find what is wrong with the code</p>