When an expression is being entered in the expression dialog, IntelliSense is now filtered by using the entered text.
When there were many properties, searching through the IntelliSense list was difficult, but with filtering, it is much easier.
Filtering is performed by partial matching, so even if you don’t know the exact name, there is a better chance of finding the property you need.

Asprova HELP
-> http://lib.asprova.com/onlinehelp/en/AS2003HELP00737000.html
-> [GUI]-[Dialogs]-[Expression dialog] – HelpNo.:737000