Sub Menu tidak muncul ketika menu di perkecil, Di bootstrap.. Menu Dinamis

ada yang tau supaya sub menu nya bisa muncul...tapi sub menu muncul kalo menu nya tidak di perkecil .. disini saya pakai framework bootstrap...

  <!-- Sidebar -->
                <ul class="nav navbar-nav side-nav" id="sidebar">

                  <li class="collapsed-content">
                    <ul>
                      <li class="search"><!--Collapsed search pasting here at 768px --></li>
                    </ul>
                  </li>

                  <li class="navigation" id="navigation">
                    <a href="#" class="sidebar-toggle" data-toggle="#navigation">Navigation <i class="fa fa-angle-up"></i></a>

                    <ul class="menu">

                      <li>
                        <a href="index">
                          <i class="fa fa-tachometer"></i> Dashboard <span class="badge badge-red"></span>
                        </a>


                     </li>


<?php


$uid = $_SESSION['uid'];
$grp = $_SESSION['grp'];

include 'conection.php';
$sql=mssql_query("SELECT DISTINCT xh,name,flag FROM [appl_navi] JOIN [appl_role] on xh = ar_xh where flag>0 and
(ar_uid ='sh' or ar_tid ='sys' )  ORDER BY name");

while ($datasubmenu = mssql_fetch_assoc($sql)){

echo '

<li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">
         <i class="fa fa-folder"></i>'.$datasubmenu['name'].'<b class="fa fa-plus dropdown-plus"></b>
            </a>';
while ($datasubmenu = mssql_fetch_assoc($sql)){

echo '
<ul class="dropdown-menu">
    <ul class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">
         <i class="fa fa-folder"></i> '.$datasubmenu['name'].'<b class="fa fa-plus dropdown-plus"> </b>
            </a> ';
while ($datasubmenu = mssql_fetch_assoc($sql)){

echo '
<ul class="dropdown-menu">
    <li><a href="#"><i class="fa fa-caret-right"></i> '.$datasubmenu['name'].'</a></li></ul>';
}

}
}

?>

                <!-- Sidebar end -->

              </div>
              <!--/.nav-collapse -->
            </div>
            <!-- Fixed navbar end

SUB MENU NYA MUNCUL

SUB MENU NYA TIDAK MUNCUL