Adding values to list box from combo box

I have a form with a combo box, a list box and a button. The combo box has been populated with the numbers from 1 to 113

What I want to do is let the user select a value from the combo box and then when the button is clicked the selected value is entered into the listbox.

I can't work out how to get values into the list box. Any ideas?

Also, how are the values from the list box stored? Is it in an array?


Thanks!