Focus on selection model checkbox using Tab key

Configuration:


Chrome 37

Ext JS 4.2.1

Description:

Want to get focus on selection model check box using Tab Key

Fiddle: https://fiddle.sencha.com/#fiddle/cgc


How to reproduce:

Do focus on Name header item text box. then press Tab OR Shift+Tab to move the focus throw all the focus able items. I tried to do the same but focus is not coming on header check box .

Do you have any suggestion on it. Any help will be appreciated

Attachment:

Issue123.png

Focus on selection model checkbox using Tab key