There is a LISTBOX control (TYPE == 10).
 
Syntax:
Window.AddControl(id, 10, X, Y, WIDTH, HEIGHT,"Item1|Item2|...");
Sample:
Window.AddControl(9,10,0,72,80,14,"Variant 1|Variant 2");
Description:
A list box is a control window that contains a list of items from which the user can choose.

X, Y, WIDTH, HEIGHT :- The horizontal base unit is equal to the average width, in pixels, of the characters in the system font; the vertical base unit is equal to the height, in pixels, of the font. Furthermore, each horizontal base unit is equal to 4 horizontal dialog units; each vertical base unit is equal to 8 vertical dialog units.

 
  GUI for script  
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