Executed when the listGrid receives a 'doubleClick' event on an enabled, non-separator record. The default
implementation does nothing -- override to perform some action when any record or field is double clicked. A record
event handler can be specified either as a function to execute, or as a string of script to evaluate. If the handler is
defined as a string of script, all the parameters below will be available as variables for use in the script. To do
something specific if a particular field is double clicked, add a recordDoubleClick method or string of script to that
field (same parameters) when you're setting up the list. Notes:
This will not be called if the click
is below the last item of the list.
This method is called from the default implementation of rowDoubleClick(), so if that method is overridden this method
may not be fired.