Profile Type on registration page - Profile Manager

Hello,

I am using the Profile Manager (great PlugIn).

But I want the users to decide on the regestrations page for one profile type. There is no possibility in the Profile Manager to have the profile-type on the registration page. So I have in my own plugin just extended the register view
elgg_extend_view('register/extend', 'myplugin/register');
with this content
 <input
   type="radio"
   name="custom_profile_fields_custom_profile_type" 
   id="custom_profile_fields_custom_profile_typeFAN" 
   value="<?php echo FAN_ID;?>"> <?php echo elgg_echo('votw_registration:fan');?>

  <input
   type="radio"
   name="custom_profile_fields_custom_profile_type" 
   id="custom_profile_fields_custom_profile_typeARTIST"  
   value="<?php echo ARTIST_ID;?>"> <?php echo elgg_echo('votw_registration:musician');?>

The IDs (ARTIST_ID, FAN_ID) I have find out by echo $user->custom_profile_type.
For the registration action I use the Profile Manager action.

The Ids are written into the database, but it seems not be the rght way, because the fields for the different profile type on the poifile-page don't show up correctly.

Somebody know how I can do this - so it works?