title: Container vs Panel in Extjs
body: <p>I have a question about Extjs</p>
  
  <p>I have read the official document on Sencha doc but I have some confusion about 2 kinds of Component .That's the Container and the Panel.</p>
  
  <p>What is the difference between Container and Panel? Which should be used in which case?</p>
  
  <p>Any answer are very appreciated.</p>