Checkbox Set/Filtering a list view

Hello forum.  Is there any method with a global checkbox set (or any checkbox set for that matter), when you uncheck all boxes (none checked) it auto enters a check mark in all boxes?

Here's what I'm trying to do and maybe there is a better way

1.  My goal is to filter a list view of customers by a global checkbox and a relationship with GTRR (two types of customers).

The checkbox is global, and the relationship is: 

CUSTOMERS|---------<CUSTOMERS_Type with the fields: Customers::gType (the checkbox)|-------<Customer::Type

Clicking on the checkbox performs GTRR in CUSTOMERS_Type.

This works fine for clicking either checkbox or both checkboxes.  However, if I uncheck both boxes (want to show all records), I'd like to see both boxes checked.

2.  The second question, when I uncheck both boxes, the found set returns 0, which it should based on this set up.  So I trap for that and do Show All Records and skip the GTRR step.  Is there anything I can do in the relationship set up to prevent the 0 record found set?  Or is just the checking/trapping for that in a script ok?

Any thoughts or help is always appreciated.

Thanks

Steve