title: Using Id and itemId in Extjs to access components
body: <p>In ExtJs Best practices I gone through not to use Id for accessing Ext Components rather use ItemId, I am very new in accessing components using <code>ItemID</code>, does any one can help me in default syntax or the way to access components.</p>
  
  <p>Also on click of yes in a message box I need to disable some components in masked page, whether this can be achieved with the help of <code>ItemID</code>? Please explain.</p>
  
  <p>I feel when using <code>ItemiD</code> it may return array of elements/components, so if need to get an exact component I need to iterate again. I have this ques too....</p>