title: How to put elements to left menu sonataadmin
body: <p>I'm trying to resolve 2 problems in Symfony 2 sonata Admin that I accualy have.
  First , I cannot put my service element through left menu , I have it in main dahsboard view and i don't know how to put it and I cannot find it in repository
  <a href="https://www.uploady.com/#!/download/6Z8lcDVEJh0/H4~7~Pl7GdfvlLvL" rel="nofollow">Screenshot</a></p>
  
  <p>My Catalog class </p>
  
  <pre><code>&lt;?php
  namespace AdminBundle\Admin;
  use Sonata\AdminBundle\Admin\Admin;
  use Sonata\AdminBundle\Form\FormMapper;
  use Sonata\AdminBundle\Datagrid\DatagridMapper;
  use Sonata\AdminBundle\Datagrid\ListMapper;
  use Sonata\AdminBundle\Show\ShowMapper;
  
  class CatalogAdmin extends  Admin
  {
      protected $baseRouteName = 'admin_category';
      protected $baseRoutePattern = 'category';
  
      protected function configureFormFields(FormMapper $formMapper)
      {
          $categoryFieldOptions = array('multiple'=&gt;true);
          $formMapper
              -&gt;add('name')
              -&gt;add('parent_id','sonata_type_model',$categoryFieldOptions)
              -&gt;add('alias')
              ;
      }
  
  
      protected function configureListFields(ListMapper $listMapper)
      {
          $listMapper
              -&gt;addIdentifier('id')
              -&gt;add('name')
              -&gt;add('parent_id')
              -&gt;add('alias')
  
  
              -&gt;add('_action','actions',array(
                 'actions'=&gt;array(
                     'show'=&gt;array(),
                     'edit'=&gt;array(),
                 )
              ));
      }
      }
  </code></pre>
  
  <p>And service:</p>
  
  <pre><code>services:
      sonata.admin.categoryedit:
          class: AdminBundle\Admin\CatalogAdmin
          tags:
              - { name: sonata.admin, manager_type: orm, group: "Category", label: "Kategoria" , show_in_dashboard: "true" }
          arguments:
              - ~
              - AdminBundle\Entity\Category
              - ~
          calls:
              - [ setTranslationDomain, [AdminBundle]]
  </code></pre>
  
  <p>And Config File (only imports tag:): </p>
  
  <pre><code>imports:
      - { resource: parameters.yml }
      - { resource: security.yml }
      - { resource: services.yml }
      - { resource: @AdminBundle/Resources/config/admin.yml}
  </code></pre>
  
  <p>And My second problem is , when I'm trying to click anything I got error:</p>
  
  <pre><code>No entity manager defined for class AdminBundle\Entity\Category
  </code></pre>
  
  <p>How to resolve that problems ?
  Best Regards</p>
  
  <p>21.01.2014
  I created errror in config.yml to see error message</p>
  
  <pre><code>at Processor-&gt;processConfiguration(object(Configuration), array(array('title' =&gt; 'NewProject', 'title_logo' =&gt; '/bundles/sonataadmin/logo_title.png', 'dashboard' =&gt; array('blocks' =&gt; array(array('position' =&gt; 'left', 'type' =&gt; 'sonata.admin.block.admin_list')), 'groupsa' =&gt; array('admin.category' =&gt; array('label' =&gt; 'Kategorie', 'items' =&gt; array('sonata.admin.categoryedit'), 'roles' =&gt; array('ROLE_ADMIN'))))))) in SonataAdminExtension.php line 78
  </code></pre>
  
  <p>I can see that label my item sonata.admin.categoryedit doesn't have any position or something , Is that OK ? maybe i should change something ? </p>