combo box
A combo box is one of three types of list object in
                     		Application Studio (the others are list boxes and option buttons). They are
                     		called list objects because they must be associated with a list and their
                     		contents can be configured in the List Designer. A combo box displays the first
                     		element of a list and has a button for accessing further elements. They act as
                     		slicers in Application Studio, allowing users to select a different slice of
                     		the data.