Checkbox and radio button validation

[eluser]Unknown[/eluser]
Hi,
I am new to codeigniter and I want to apply the codeigniter validation on checkbox and radio buttons. and also how to maintain the state after the validation.
Regards.

[eluser]InsiteFX[/eluser]
CodeIgniter Users Guide - Form Helper

CodeIgniter Users Guide - Form Validation

[eluser]Unknown[/eluser]
My problem is this that if no any checkbox is checked than message display to check any one.

sorry! for my week english.