I saw program once that had an icon on the side of a data entry box. The user could type in the info such as a number "01" or they could left mouse click on the icon and a box would open a table with the numbers in it such as "01" , "02" etc. The user could then right mouse click on the number and it would appear in the afore mentioned data box. How do you do this?

Thanks in advance for your help.

Randall