How to handle Many-to-Many tables

I have table_1 with a primary key, x
I have table_2 with primary key y
Table_3 represents the many-to-many relationship between table_1 and table_2, and has a primary key x,y.
Okay - so I know how to set up master detail forms for table_1 and for table_2, but what type of form do I use for table_3? I want to use the primary key of table_1 as an item (:pagenum_x, I guess) and then select from a drop-down list for key y.
I am am newbie, so if this is somewhere in the documentation (I can't find it after a few days trying), just tell me to keep looking. :)
Norm

Vojin,
Thanks for the reply. It helps to have some corroboration when these types of issues come up.
I can create regions or pages that handle the associations, but it seems as though I am fighting or fooling the product (APEX) to do so. Maybe adding the rowid with a sequence / trigger will simplify the design.
Thanks,
Norm

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