This is a slightly modified version of the RowEditor. Changes have been made to startEditing and stopEditing:

startEditing - uses what may be an application-specific change to add a fake record to any Ext.form.ComboBox Editors if a record corresponding to the ID of the Combo's hiddenName is not present. This is to present a human-readable value in the combo before the combo's store has loaded.

stopEditing - if an Editor has a getSubmitValue method defined, this is used instead of getValue. This is useful for checkboxes, which sometimes don't return what is needed.