Member variable XbpDialog():sysMenu Foundation
Determines whether to include the system menu in the title bar of the dialog window.
By default the instance variable :sysMenu contains the value .T. (true) and the dialog window has a system menu. In order to suppress the menu, :sysMenu must be set to .F. (false).
The system menu is displayed under Windows only if :taskList is set to .T. (true).
An MDI client window always has a system menu unless :titleBar is set to .F. (false).
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