Displaying a Tree like view of rows in crystal reports

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C#

CrystalReports

Hi buddies
there is a Database table Named "Product" which stores Product Specifications and attributes. each Product has 0,1 or many child product . if it has no child product, the product is child product and should be displayed at the bottom of the parent row in a tree-like Crystal report ( by tree-like report I mean, some indentations for child products). if you ask how child and parent products are distinguished, I would answer, by a special column named id_index_product which for every product shows its parent ( parent id) and if the column would be Null, that is the Parent of parents Product which has to be shown at the top of the report.
What I have in mind is something like this :

Product1        (Parent of parents)
  Product2 (child of P1)
  Product3
    Product4  (child of P3)
  Product5
    Product6
      Product7
Product8        (Parent of parents)
 Product9
 Product10

I've used grouping and Hierarchical grouping but I think I used them incorrectly. so no success is achieved.

I wonder if you guide me how to get it done.
I use VS 2008 (C#)- and Crystal Reports Basic for VS 2008