faceviij iframe app: using ajax loading xfbml... possible?

Question

ok so in the main page, all of my xfbml is rendering (bookmark button for example) but when i create a button to load the multi-friend selector into a div, nothing is redering (ajax loading pages with php and stuffs doesnt contain xfbml works)

so what im i missing here? i thought the cross communication channel in the main page will render the xfbml? do i need to call it again??

code:

<fb:serverfbml style="width: 755px; height:500px;">
    <script type="text/fbml">

      <fb:fbml>
          <fb:request-form
                    action="<?=$invite_href?>"
                    method="POST"
                    invite="true"
                    type="XFBML"
                    content="<? echo htmlentities($content,ENT_COMPAT,'UTF-8'); ?>"
              >

                    <fb:multi-friend-selector
                    showborder="false"
                    actiontext="Invite your friends!.">
        </fb:request-form>
      </fb:fbml>

    </script>
  </fb:serverfbml>