Official Sencha grid example unable to tab on read-only cell but right arrow works

Tab support is not working with read-only grid as demonstrated from 100% code provided by Sencha example, see -> http://ift.tt/1FhKReN





You focus on first cell, then you can see that right and left arrow works, but tab is not.

Official Sencha grid example unable to tab on read-only cell but right arrow works