He guys,

I´ve made an product catalogue following this tutorial: http://www.ssbits.com/tutorials/2010/dataobjects-as-pages-part-2-using-model-admin-and-url-segments-to-create-a-product-catalogue/

Now I have an Page where all products from all categories are listed. My problem is, I can´t figure out how to sort my products on the CategoryPage by categories and then by the title of the product, so that the products from one category are standing together.
I try to modify the getProductsList-function like this:

public function getProductsList()
   {
      return $this->Products(Null, 'Category.Title ASC, Title ASC');
   }

I can´t figure out, how to call the category from the products.

Does anyone have a solution? I hope the problem is clear.

Thanks for reply. No, I don´t use the module. Start working on the project before the module came out.
I followed the tutorial and used that code.

GroupBy(Category) and SortBy(Category) doesn´t work:
<% control Products.GroupBy(Category) %>
            <div class="produktthumb">
               <a href="$Link">
                  <h2>$Title</h2>
                  <span class="price">$Price</span>
                  <div class="clear"></div>
                  $Image.CroppedImage(250,175)
               </a>
            </div>   
<% end_control %>

<% control Products.GroupBy(Category) %> and <% control Products.SortBy(Category) %> only returns nothing.
<% control Products.GroupedBy(CategoryPage) %> and <% control Products.GroupedBy(Categories.ID) %> returns only one product.