title: TabPanel focus issue
body: <p>I've provided a link to the sencha fiddle of the example I have issues with. Basically when I have tabPanels as the element at the bottom of the window if I scroll down to them and try to click on any of its tabs, the whole scroll jumps to the top of the window. And by that makes the use of tabPanel almost impossible. I'm not sure if its the layouts or I am doing something else wrong.</p>
  
  <p>here's the sencha fiddle link</p>
  
  <p><a href="https://fiddle.sencha.com/#fiddle/uv9" rel="nofollow noreferrer">https://fiddle.sencha.com/#fiddle/uv9</a></p>