title: 8 questions about facebook registration plug-in
body: <p>I am working in c#.net 4.0 and trying to impliment facebook registration plug-in as documented here  <a href="http://developers.facebook.com/docs/plugins/registration/" rel="nofollow">developers.facebook.com/docs/plugins/registration</a>.
  in the way of implimentation facing the following issues, can someone please provide the answers of following question.</p>
  
  <ol>
  <li>All the fields are required, how to add optional fields?</li>
  <li>When I add more than 3 items in a drop down list it start to giving error, whereas if more items are required a project then?</li>
  <li>Max 16 fields can be added in FB registration form, if some more fields are needed then what to do?</li>
  <li>No way to add radio button?</li>
  <li>How to add check for terms &amp; conditions?</li>
  <li>How to add client side and server side async validation both at a time?</li>
  <li>How to validate more than one fields by using async validation, like (email, username, coupon)?</li>
  <li>How to add default text/value in a textbox.</li>
  </ol>
  
  <p>Thanks in advance.</p>