Cannot get user input from dynpage component

Hi!

What I am basically trying to do here is have a dynpage with a drop-down list of choices. I have the drop-down list placed within a gridlayout in the doProcessBeforeOutput() method where I assign an id to it. In my onSubmit() method I try to get the chosen input from the list like this:

AbstractDataType drop_down = context.getDataForComponentId("date_operators");

String str = drop_down.toString();

This is using the exact same id as when I first created the drop-down list, but for some reason drop_down in the code above is null. Why is this happening? Is it maybe because the list is in a GridLayout? Am I placing the calls in the wrong dynpage method? I would really appreciate any ideas on this.

Cheers,

--Sebastian