+if ($request->isPost()) {
+  $group_id = $request->getParameter('group');
+  $user->setOnBehalfGroup($group_id);
+} else {
+  $group_id = $user->getGroup();
+}
+
+$form = new Form('subgroupsForm');
+$groups = $user->getGroupsForDropdown();
+if (count($groups) > 1) {
+  $form->addInput(array('type'=>'combobox',
+    'onchange'=>'this.form.submit();',
+    'name'=>'group',
+    'style'=>'width: 250px;',
+    'value'=>$group_id,
+    'data'=>$groups,
+    'datakeys'=>array('id','name')));
+  $smarty->assign('group_dropdown', 1);
+}
+
+$smarty->assign('subgroups', $user->getSubgroups($group_id));
+$smarty->assign('forms', array($form->getName()=>$form->toArray()));