Cannot Lookup Dependent Dropdown in Detail Page From Header Page

check this :

http://www.asprunner.com/forums/topic/22622-base-details-dropdown-from-master-table-selection

I'Ve Tried, it's not work For me.

Sergey Said that its need some coding will be required.

1. You need to use onchange event of your first lookup wizard to execute an AJAX call to some external PHP file sending the value of selected item. This PHP file needs to be created outside of PHPRunner, you need to create it manually. This file needs to accept the value of selected item and save it in session variable.
   
2. In your child table lookup wizard you can filter data by that session variable.
   But I'm Still Confuse to Solve it.

This is a usefull tutorial but not for master detail dependent lookup:
http://www.asprunner...dropdown-boxes/
Make and Model fields in sample code are in the same table. I tried to put the Model field in detail table and modify the code with no luck until now.