mvCtrl is an object variable. To assign a control  to an object variable, you
must use the Set statement:

Dim mvCtrl As Control
Set mvCtrl = Me.ActiveControl
MsgBox mvCtrl.Value

When you are done with an object variable, you should free memory used by it
with another Set command:

Set mvCtrl = Nothing

What actually happens? Do you get an error message?

Don't know if you copied your code into the eMail or retyped it.
I think you retyped it due to the lower case on dim, me, and
activeControl.name

Not that this is your problem.

Might try keeping your names the same:

dim mvCtrl as control
mvControl = me.activeControl.name

If mvCtrl.value .....

SHOULD READ:

dim mvCtrl as control
mvCtrl = me.activeControl.name

If mvCtrl.value .....