This class represents a lookup field on the form. This can be either a field on the main form, or on a related list. It extends the class B25.FormField, so it has all the methods defined there, and has extra support for adding SearchHandlers.
Adds a search handler to this lookup field. This handler will be called when the user searches in this lookup. Note: calling this method outside of the customize method (defined in B25.Form.Customizer) has no effect.
The search handler to generate custom results when the user searches in this lookup.