Disable single button of buttongroup - extjs

Question

I am having button group in which I am having 4 buttons...I want to disable particular button on some button click.. how can i do this?

I have tried :

    buttonItemID.disabled = true.  (radarbutton.disabled = true)

but cant get result.

please give me solution

Answer 1

Ext.ComponentQuery.query('button#buttonItemID')[0].disable();