Field Selection using triggers

[#1]

I have two fields in two different tables which have same values i.e. it can act as a Primary Key. If i am joining those tables with that field, ambigous loop is getting formed. so i have renamed one field as FIELD1 and other as FIELD2. I have two list boxes with FIELD1 and FIELD2. Now i want that if i select any value in first list box the same value in the second list box should be selected. How can we do this using triggers ??

I am attaching a sample qvw file here.

[#2]

Open document properties. In the tab "Triggers" go to "Field Event Triggers".

Add a trigger for the "On Select" event of the field "Region1". This tigger must be an action "Select in Field", field: "Region2" and Search String: "=only(Region1)".

With this, when one value of region1 is selected, the same value of region2 will be selected too.

[#3]

Quick follow up question that might solve my current issue, what is 2 or more values were selected in the Region1 field and the desire is for Region2 to have the exact same selections?

This works fine for me with 1 value, but isn't working for 2 or more.   I was using =Region1 (to follow this example) instead of =only(Region1)

Thanks very much!

Richard

[#4]

FYI  in case it helps someone else, I was able to get this to work by using:

='('&Concat(DISTINCT REGION1,'|')&')

as the Search String so that all selected values are duplicated between fields.