I would like to know if there exists a method to make a data entry field on a Dynamics screen required to have an entry, such that a tab or cursor off the field causes an error if left empty.  I am aware of the blankerr property in the customization window, but that only alerts the user when they try to save a record or leave the screen.  I am looking for notification that a field was left blank immediately after that field is tabbed off of.

thanks!