title: Add button in header of tab panel in extjs
body: <p>I have added a tab panel in Extjs. When i click on second tab i would like to see a component in header area of tab panel,
  at red mark, below in the image.
  <a href="https://i.stack.imgur.com/BGpr7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BGpr7.png" alt="enter image description here"></a></p>