Please, Help. How I can use 2 addFieldToTab with 1 getCMSFields

<?php
/**
* Defines the HomePage page type
*/

class HomePage extends Page {

static $db = array (
      'SolutionName' => 'Text'
   );
   
static $has_many = array(
      'Slideshows'=>'Slideshow'
);

   public function getCMSFields()
   {
      $f = parent::getCMSFields();
      $manager = new FileDataObjectManager(
         $this, // Controller
         'Slideshows', // Source name
         'Slideshow', // Source class
         'FullImage', // File name on DataObject
         array(
            'Title' => 'Title',
            'Description' => 'Description'
         ), // Headings
         'getCMSFields_forPopup' // Detail fields (function name or FieldSet object)
         // Filter clause
         // Sort clause
         // Join clause
      );
      
      // If undefined, all types are allowed. Pass with or without a leading "."      
      $manager->setAllowedFileTypes(array('jpg','png'));
      
      // Label for the upload button in the popup
      $manager->setBrowseButtonText("Upload (JPG or PNG only)");
      
      // In grid view, what field will appear underneath the icon. If left out, it defaults to the file title.
      $manager->setGridLabelField('Name');
      
      // Plural form of the objects being managed. Used on the "Add" button.
      // If left out, this defaults to [MyObjectName]s
      $manager->setPluralTitle('Slideshows');
            
      $f->addFieldToTab("Root.Content.Slideshows", $manager);
      $f->addFieldToTab("Root.Content.Main", new TextField('SolutionName'), 'Content');

      return $f;
   }
}

class HomePage_Controller extends Page_Controller {

}
?>

Sorry, but how does it help me? In this code))