Geb: how do I select a value from a dropdown?

I've found emulating the user exactly is the best way to do this. First click on the <select>, then click on the <option> that you want.

$('#submitterState').click()
$('#submitterState').find("option").find{ it.value() == "102727" }.click()

Obviously this looks way nicer in a method call, but this should get you going.