2 combobox related the primary/foreign key tables

Hi There,

I have a basic question, I am trying to use SilverLight5 to do what I thought is a simple thing

I have two tables in SQL Server (one TblGroup and one TblSubGroup) with foreign key constraints between the two

I want the behavior to be : 

• the first combo is populated with the TblGroup Data 
• once a selection changes on first combo, update the second combo with the list of the TblSubGroup

I used EntityFramework and Domain Service Class.

How would I simply achieve this? unfortunately my SL knowledge is quite lite

Thx,

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