How to tell when a table field has changed

[Bill Vlahos]

How do I tell when the contents of a table field have changed?

It doesn't seem to generate a closeField message which is what I  
really want.

Recipe (Rev 3 IDE. Mac OS X 10.5.5)
1. Create a table field
2. Set the script to:
on closeField
    put "Close Field"
end closeField

on exitField
    put "Exit field"
end exitField

3. Edit the contents of the field or even click off the field. Nothing  
is put in the message box.

Bill Vlahos