Combo are controls that allow the user to choose an item from a list of items, or optionally enter a new value by typing it into an editable text field. Often, Combos are used in the same place where a single selection List widget could be used but space is limited. A Combo takes less space than a List widget and shows similar information.
The following are the important constructors of Combo class.
Combo(Composite parent, int style)
Constructs a new instance