Filter Second Datagrid from First Datagrid

Question

I'm trying to filter a 2nd datagrid when you click a row from
the 1st datagrid. I wrote some ASP code that takes a recordset and
converts it to XML. The XML is working fine when doing this.
The application is a list of trainers and superusers at a
hospital. The list of people is the first datagrid and the
curriculums they can teach is the second. Each trainer can have 1
or more curriculums that they can teach.
The first datagrid (the one I want to click on to filter the
second datagrid) is called "Trainers" and the field I want to use
as the key to pass to the second is "Trainer_ID." The second
datagrid is called "Roles" and shares a column called "Trainer_ID"
that identifies a trainer and a curriculum (role) they can teach.
I was hoping someone could help me by posting an example of
the code I could use to do this filter? I'm new to Flex, but
experienced with ASP and ASP.NET. Love what I'm doing with flex
though. Here is a link to the application itself:
Test
Link for Application
Here is my code so far:

Answer 1

Basically, what Amy's example shows, is using the
filterFunction property of the ArrayCollection to filter the rows.
filterFunction takes a reference of a function, that's called for
each row in the ArrayCollection and it returns a boolean deciding
whether you want to keep this row or not.
once filter has been applied, you need to call refrehs()
function to see the changes.
http://blog.flexexamples.com/2008/03/12/using-a-combobox-to-filter-items-in-a-datagrid-in- flex/
http://blog.flexexamples.com/2008/09/12/using-a-slider-to-filter-items-in-a-datagrid-contr ol-in-flex/
ATTA