Level-0 Widgets Only. The SYSTEM MENU attribute creates a system menu box in the upper-left corner of the title bar. The SYSTEM MENU will contain the equivalent of a MENU BUTTON for each non-null element in the string array, and all elements after the first null string are ignored. Only one MENU BUTTON is created if the type is a scalar string. The label(s) for the MENU BUTTON(s) are the contents of the string or string array.
