title: Add category attribute with WYSIWYG enabled
body: <p>I'm following this tutorial: <a href="http://www.atwix.com/magento/add-category-attribute/">http://www.atwix.com/magento/add-category-attribute/</a>
  All is working well, attributes are added to categories, but without the WYSIWYG button below the field. WYSIWYG is enabled in System > Config > Content Management.</p>
  
  <pre><code>$this-&gt;startSetup();
  $this-&gt;addAttribute('catalog_category', 'custom_att', array(
      'group'         =&gt; 'General',
      'input'         =&gt; 'textarea',
      'type'          =&gt; 'text',
      'label'         =&gt; 'My attribute',
      'backend'       =&gt; '',
      'visible'       =&gt; true,
      'required'      =&gt; false,
      'wysiwyg_enabled' =&gt; true,
      'visible_on_front' =&gt; true,
      'is_html_allowed_on_front' =&gt; true,
      'global'        =&gt; Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,
  ));
  $this-&gt;endSetup();
  </code></pre>
  
  <p>Whatever I try, WYSIWYG is not enabled for my attributes. Can anyone help? Or maybe there is a workaround for this?</p>
  
  <p>EDIT: I searched other posts but all say that this code should add the WYSIWYG:</p>
  
  <pre><code>'wysiwyg_enabled' =&gt; true,
  </code></pre>
  
  <p>but it doesn't.</p>