multiple radio button and checked set

 "types"=>array(
                "gender"=>array(
                        "type"=>"radio",
                        "options"=>array("Male"=>"Male","Female"=>"Female"),
                        "checked"=>array("Male"),
                        ),
                        
            ),

sry if i didn't read or trace allt he things, but this might help, and sorry for a lil bit messy