class Category extends DataObject {
   static $db = array(
      'Name' => 'Text',      
      "Type" => "Enum('Business, Event, Community', 'Business')"      
);
   static $default_sort = "Name";

static $has_one = array(   
'Parent' => 'Category'
);
   static $has_many = array(
      'Children' => 'Category'
   );

   function getCMSFields_forPopup() {
      $fields = new FieldSet();
      $fields->push( new TextField( 'Name' ) );      
      $fields->push( new DropdownField("ParentID", "Parent Category", array()));      
      $fields->push( new DropdownField("Type", "Type",
         array(
            'Business' => 'Business',
            'Event' => 'Event',
            'Community' => 'Community'
         )
      ));      
      return $fields;
   }
}