How do I get a MS Access form to dynamically a table field name. I need the button's caption to change, if I change the field name is changed.

How do I get a MS Access form to dynamically a table field name. I need the button's caption to change, if I change the field name is changed.

I understand how to use DLookup and use DLookup to render in a text box, but the automatic update part is what's getting me.