views argument depended by ahah form

I'm trying to display an already built view with an argument which depended by an ahah form ( I use ahah helper ). In the example below, $group_nid is the argument and I pass it like this : views_embed_view($viewName, 'default', $group_nid). The problem is that I can't display both the ahah form AND the view. If I use " return $view_content; ", I can display the view. If I use " return $form; ", I can display the form. I need to display both. How can I achieve it ?

Thank you

function standings_form($form_state) {
  
   $form = array();

   // Register the form with ahah_helper so we can use it. Also updates
   // $form_state['storage'] to ensure it contains the latest values that have
   // been entered, even when the form item has temporarily been removed from
   // the form. So if a form item *once* had a value, you *always* can retrieve
   // it.
   ahah_helper_register($form, $form_state);

   // Determine the default value of the 'usage' select. When nothing is stored
   // in $form_state['storage'] yet, it's the form hasn't been submitted yet,
   // thus it's the first time the form is being displayed. Then, we set the
   // default to 'company'.
   if (!isset($form_state['storage']['groupset']['dropdown'])) {
    $group_nid = 3;
   }
   else {
    $group_nid =  $form_state['storage']['groupset']['dropdown'];
   }

   $form['groupset'] = array(
    '#type'   => 'fieldset',
    '#title'  => t(''),
    '#prefix' => '<div id="group-wrapper">', // This is our wrapper div.
    '#suffix' => '</div>',
    '#tree'   => TRUE, // Don't forget to set #tree!
   );

   $form['groupset']['dropdown'] = array(
    '#type' => 'select',
    '#title' => t('Όμιλος'),
    '#options' => array(
      '1' => t('group 1'),
      '2' => t('group 2'),
      '3' => t('group 3'),
    ),
    '#default_value' => $group_nid,
    '#prefix' => '<div class="clear-block">',
    '#suffix' => '</div>',
    '#ahah' => array(
      'event'   => 'change',
      // This is the "magical path". Note that the parameter is an array of
      // the parents of the form item of the wrapper div!
      'path'    => ahah_helper_path(array('groupset')),
      'wrapper' => 'group-wrapper',
      ),
   );

   $form['groupset']['update_usage'] = array(
    '#type'  => 'submit',
    '#value' => t('Update usage'),
    // Note that we can simply use the generic submit callback provided by the
    // ahah_helper module here!
    // All it does, is set $form_state['rebuild'] = TRUE.
    '#submit' => array('ahah_helper_generic_submit'),
    // We set the 'no-js' class, which means this submit button will be hidden
    // automatically by Drupal if JS is enabled.
    '#attributes' => array('class' => 'no-js'),
   );

   $view_content = $form;
   $viewName = 'league_standings';
   $view_content .= views_embed_view($viewName, 'default', $group_nid);
   
   return $view_content;
 
}