public function getEditForm($id = null, $fields = null)
 {
     // get the cmsfields from ModuleManager DataObject
     $moduleManager = ModuleManager::current_module_manager();
     $fields = $moduleManager->getCMSFields();
     // what pages is this module active on
     $modulesGridField = GridField::create("Modules_Gridfield", "Modules", Module::get(), $modulesGridFieldConfig = GridFieldConfig_RecordEditor::create());
     // add multiclass dropdown for modules
     $modulesGridFieldConfig->removeComponentsByType('GridFieldAddNewButton');
     $modulesGridFieldConfig->addComponent(new GridFieldAddNewMultiClass());
     // add the fields
     $fields->addFieldToTab('Root.Modules', $modulesGridField);
     // module positions tab
     $positionsHtml = '<h2>Module positions</h2>';
     $positionsHtml .= '<p class="message info">To change these you need to edit the positions specified in the <code>_config.php</code> file. These are your currently configured positions available:</p>';
     foreach (ModuleManager::config()->positions as $position) {
         $positionsHtml .= '<p>&bull;&nbsp; <strong>' . $position . '</strong><br />&nbsp; &nbsp; Use in your template with <code>$ModulePosition("' . $position . '");</code></p>';
     }
     $positionsHtml .= '</ul>';
     $fields->addFieldToTab('Root.Positions', LiteralField::create('html', $positionsHtml));
     // actions
     $actions = $moduleManager->getCMSActions();
     $form = CMSForm::create($this, 'EditForm', $fields, $actions)->setHTMLID('Form_EditForm');
     $form->setResponseNegotiator($this->getResponseNegotiator());
     $form->addExtraClass('cms-content center cms-edit-form');
     // don't add data-pjax-fragment=CurrentForm, its added in the content template instead
     if ($form->Fields()->hasTabset()) {
         $form->Fields()->findOrMakeTab('Root')->setTemplate('CMSTabSet');
     }
     $form->setHTMLID('Form_EditForm');
     $form->loadDataFrom($moduleManager);
     $form->setTemplate($this->getTemplatesWithSuffix('_EditForm'));
     // Use <button> to allow full jQuery UI styling
     $actions = $actions->dataFields();
     if ($actions) {
         foreach ($actions as $action) {
             $action->setUseButtonTag(true);
         }
     }
     return $form;
 }