A Zoomable Text or List Box contains a button control in its lower-right-hand corner that enables the box to be expanded or contracted by the user, to reveal more or less of its contents. The button control has a plus sign in it when the box is not zoomed, and a minus sign when it is zoomed.
To create a Zoomable Text or List Box, the ZOOMABLE command is applied to a text or list box property.