APM - Radio control values from variable

I've found the solution using this example

Problem can be solved adding this javascript to "function OnLoad()" in logon.inc:

var full_group_list = "%{session.custom.groups}";
var groupArray = full_group_list.split(";");
groupArray.sort();
var newDiv=document.createElement('div');
var radioHTML = "";
for(i=0; i"+groupArray[i]+"";
}
newDiv.innerHTML= radioHTML;
document.getElementById("dynamicInput").appendChild(newDiv);

dynamicInput element needs also to be defined:

    case "radio":
        foreach( $options as $k=>&$o ){
            $fieldStr .= "{$o}";
        }
        $fieldStr = "";
    break;