Iīm using the Dlookup method to recover data from a table and use it in a form. The method is working ok and the value is retrieved. But the value is not exhibited properly. It populates a not coupled box but it is displayed only if a set focus in this controlbox. Why? How to correct it?

Thanks for any help.

My code:
Me.eCarta = DLookup("[aCarta]", "InfoCarta", "[CTRL] = 'a'")