How to change the default sort mechanism of grid column

[samir_ware]

Helllo All
I am willing to have custom sorting mechanism for column sorting in grid. Is there any hook EXT has provided for such custom sorting ?
Thanks
Samir

[evant]

http://docs.sencha.com/ext-js/4-1/#!/api/Ext.data.Field-cfg-sortType

[samir_ware]

Thanks Evan ...
That helps .
Thank you very much

[adityavarma.mca]

It saved my time....