ComboBox1

I have generated a ComboBox1 in a UserForm1.
I have a list of data in Sheets("DoNotUse").Range("L3", "L57").
How do I get that list into my ComboBox.

If it helps, this list is called 'grade' using 'Insert', 'Name', 'Define'.
Is a ComboBox the best thing to use or should I be using a ListBox?

I'm using Office97 so I think it is something to do with the RowSource in Properties.
I have put L3:L57 in the RowSource but how do I tell it that its L3:L57 on Sheets("DoNotUse") which is different from the sheet that I will be calling the UserForm from??