Adding a new item to a list, via a Macro or Module?

[harpscardiff]

My database consists of a tab control page.

On the first tab, I got a drop down on username. Beside that I have a button, called ADD.
The function of the button is to add new usernames as of when I need to. The dropdown should become a textbox, to allow an entry and store it in the system table.

How do I do this?

Thanks in advanced

 

[Mile-O]

Even neater would be to use the combo's NotInList event.

Have a look at this.