Param1Desc{Handle to a listbox or combobox gadget}CommandName{addItem}HelpPath{Special}ReturnValue{}OpenBrace{ }Parameters{handle gadget, str item}CloseBrace{}Description{Adds a new item to a combobox or listbox}Param1{gadget}Param2{item}Param2Desc{Text of new item}Remarks{Unlike BlueGUI version 1, under version 2 only comboboxes and listboxes can use this command.  Popup menus should use addMenuItem, listviews should use addListViewItem.}