Disable a checkbox in datagrid row dynamically

[aswzen]

How to disable a checkbox in datagrid row dynamically through an javascript action?

see this fiddle:
http://jsfiddle.net/oo9dvb7x/

when i press the button then error comes up
Uncaught TypeError: Cannot read property 'dc' of undefined

Thank You  in advance

[stworthy]

The code to get the <tr> element should be:

Code:

var dg = $('#BRAND_TABLE');
var opts = dg.datagrid('options');
var tr = opts.finder.getTr(dg[0], index);

Please look at this updated example http://jsfiddle.net/oo9dvb7x/1/

[aswzen]

okay thankyou