[xwiki-users] Dynamic 'Database List' / 'Static List' on a page

Hello, I´m looking for a dynamic 'Database List' at my Wiki. I wan´t to select with the first 'Database List' the category and then select multiple items of sub categories in the second 'Database List'. The second 'Database List' has to show the actual sub categories dependent of the selected first 'Database List'. Database: +Category_1 |-Subcategory_1_1 |-Subcategory_1_2 |-Subcategory_1_3 |-Subcategory_1_4 +Category_2 |-Subcategory_2_1 |-Subcategory_2_2 |-Subcategory_2_3 |-Subcategory_2_4 +Category_3 . . . . I´m testing the 'Database Tree' but when multiselect is enabled I can select items in all Categories. Is there a possibility to realize this with standard classes? Have I got to use a script like java script or something similar. Have somebody an example or some information how to design this on a xwiki database? Thank you very much! Best Regrades Juergen