Fill table Details in a menu drop-down

Hello
I'm new to adf and using Jdevloper 11 g.
I have 2 tables of categories and services. I fill the table 'services', from the selected category.
After reading several articles/articles, I managed to create a link between these two tables.
And on the jsf page, I can then create a form-master-detail table layout.
But I don't want a form to display for the master, I want just the drop down menu to display categories and based on the chosen category, the table below should
be filled.
I have tried various attempts to create a component from selectonechoice and then adding somehow linking of external action, but it does not work.
I'm sure I'm missing out on something important which explains why it does not work but I am unable to understand.

I also tried using only items from view (instead of link), adding a variable to bind to the query and then adding "call action-execute with params", but it's still not working.
Can someone please guide me further, I'm kinda stuck at this point.

Thanks in advance
Ash

You can use a navigation list:
http://blogs.Oracle.com/Shay/2008/11/the_navigation_list_select_som.html

Tags: Java

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