Adds a list entry to the custom list. displayValue is used to set the list entry
display value and returnValue is used to set the list entry return value.
Each entry within a list contains a display value (the value displayed to the user) and a
return value (the value returned to the server when a selection is made - this becomes the field value).
displayValueis used to set the list entry display value andreturnValueis used to set the list entry return value.Each entry within a list contains a display value (the value displayed to the user) and a return value (the value returned to the server when a selection is made - this becomes the field value).