How Do I Make Something In A List Box The Default Choice?

Try Selecting It.

If you want code to make the selection, you could try the following (you may have to adapt it to fit your own requirements).

Listbox1.Selected(0)=True

The 0 represents the first selection in the listbox. If you want to have say the 3rd selection in the listbox to be selected, you would change the 0 to a 2.