Why does a toplevel window have different decorations than I specified?
The toplevel windows (anything derived from FXTopWindow) can have various decoration hints, such as DECOR_TITLE, DECOR_BORDER, and so on. FXTopWindow passes these hints to the underlying system. On X11, a separate program called a Window Manager is responsible for interpreting these hints and applying the appropriate borders, title bar, close buttons, minimize and maximize buttons and so on. On Microsoft Windows, this is done by the GDI layer. Either way, the decorations specified from within the FOX program are just hints:- the interpretation of these hints depends on the underlying system, and is therefore out of our jurisdiction. There are many Window Managers under X11, such as KDE, WindowMaker, FVWM, Motif Window Manager (MWM), and so on. The ICCCM document details a few common conventions that Window Managers are supposed to adhere to; unfortunately, decoration styles are not part of this document. Because of its historic popularity, many Window Managers have opted to follow the
