[flexcoders] Using a getter as a labelField

[madflexcoder]

Is it possible to use a getter as a labelField? I've been unsuccessful
in my attempts to do it. I have a value object that I would like to
concatenate two strings together to form the label. Instead of writing
a label function I'd rather just have a getter function that does the
same thing. A good example is using a first name and last name as the
label field.