Box.prg
 Simple box menus
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     BoxMenu( <aMenuItems>, [<nTop>], [<nLeft>], [<nBottom>], [<nRight>],
        [<cMenuTitle>], [<nChoice>], [<cBoxChars>],
        [<cColorString>] ) --> nChoice

     Paint quick and simple menu inside a box with a drop shadow. Returns a
     numeric value which denotes the subscript of the array passed to the
     BoxMenu() function which holds the menu prompts. One menu choice per
     element.

     BoxShadow( <nTop>, <nLeft>, <nBottom>, <nRight> ) --> NIL

     Draw a box shadow with see through.