Categories in post_type

Anybody knows how can I list the categories from post_type in my sidebar?

This is my post_type code:

add_action('init', 'loja_register');

function loja_register() {
    $labels = array(
        'name' => _x('Loja', 'post type general name'),
        'singular_name' => _x('Loja Item', 'post type singular name'),
        'add_new' => _x('Novo item', 'loja item'),
        'add_new_item' => __('Adicionar Novo Item'),
        'edit_item' => __('Editar Item'),
        'new_item' => __('Novo Item'),
        'view_item' => __('Ver Item'),
        'search_items' => __('Buscar Loja'),
        'not_found' =>  __('Nothing found'),
        'not_found_in_trash' => __('Nothing found in Trash'),
        'parent_item_colon' => ''
    );
    $args = array(
        'labels' => $labels,
        'public' => true,
        'publicly_queryable' => true,
        'show_ui' => true,
        'query_var' => true,
        'rewrite' => true,
        'capability_type' => 'post',
        'hierarchical' => false,
        'menu_position' => null,
        'supports' => array('title','editor')
      );
    register_post_type( 'loja' , $args );
}

//categorias
register_taxonomy("Categorias", array("loja"), array("hierarchical" => true, "label" => "Categorias", "singular_label" => "Categorias", "rewrite" => true));

//campos do adicionar/editar posts
add_action("admin_init", "admin_init");

function admin_init(){
  add_meta_box("valor_produto-meta", "Valor", "valor_produto", "loja", "side", "low");
}

function valor_produto(){
  global $post;
  $custom = get_post_custom($post->ID);
  $valor_produto = $custom["valor_produto"][0];
  ?>
  <label>Valor:</label>
  <input name="valor_produto" value="<?php echo $valor_produto; ?>" />
  <?php
}

add_action('save_post', 'save_details');
function save_details(){
  global $post;
  update_post_meta($post->ID, "valor_produto", $_POST["valor_produto"]);
}

//mostrar conteudo no admin
add_action("manage_posts_custom_column",  "loja_custom_columns");
add_filter("manage_edit-loja_columns", "loja_edit_columns");

function loja_edit_columns($columns){
  $columns = array(
    "cb" => "<input type=\"checkbox\" />",
    "title" => "Produto",
    "description" => "Sobre",
    "valores" => "Valor",
    "categoriess" => "Categorias",
  );
   return $columns;
}
function loja_custom_columns($column){
  global $post;
  switch ($column) {
    case "description":
      the_excerpt();
      break;
    case "valores":
      $custom = get_post_custom();
      echo $custom["valor_produto"][0];
      break;
    case "categoriess":
      echo get_the_term_list($post->ID, 'Categorias', '', ', ','');
      break;
  }
}

Thanks!