Field Validation on exit

[Pasrandy]

I am trying to get Filemaker 8 to perform field validation (a plug-in that executes a script) when exiting a field rather than when the record is committed (by clicking outside the field or going to another record). It seems this is only possible with a Global field but not a text, number, or date field. The Filemaker Knowledge Base says that I should "use the new auto-enter calculation overwrite feature to trigger this plug-in at the same time [as exiting a field]" but that doesn't seem to accomplish what I want either. Any suggestions?