Do the conversion in the AfterUpdate event of the control.

Steve

Mark,
You asked, and Steve answered you, about Proper Case in fields.

A person's name is important to them.

It's not quite as simple a question as you asked, nor is the answer as
easy as Steve suggested.

Yes, using StrConv() after entering mARK anders  the name will be
converted properly to Mark Anders, but how should Access capitalize
names like Martin van Buren, Sean O'Leary, Hendryk van der Meer,
Louise Smith-Jones, or  Francis McDaniels.

Each of those will be improperly capitalized (using StrConv() ) to:
Martin Van Buren, Sean O'leary, Hendryk Van Der Meer, Louise
Smith-jones, and Francis Mcdaniels.

And then, some names can be capitalize in several ways.
For example, McDonald and Mcdonald are both correct, depending upon
the wishes of the named person.

It would be wise to use some method of checking for unusual
capitalization's before using StrConv().
I use a table of exception names. DLookUp the entered name and present
a message if the name is on the list, offering the alternative
spelling before changing it. Additional names can then be added to the
table, when needed.