title: Ext.getCmp not working in extjs
body: <p>I am using Ext.getCmp for finding one extjs component in tab panel. some times it is not working an returning undefined.</p>
  
  <pre><code>var currComp = Ext.getCmp('myId'); //Id is generated by me on creation
  </code></pre>
  
  <p>Is any other method exists? to find one Component if i know its id?</p>