You can implement this using 2 xtypes.
(1) xtype = panel or container to display the html or top. (2) xtype = fieldset for the middle content.
Once this sencha app renders in the browser, it will be converted into series of divs and spans. So, 1# will give you more control to manipulate the text.
I have implemented the same for you on senchafiddle, you can have a look,
http://www.senchafiddle.com/#PHRyc
Hope it helps.