@dannye Function fl_overlay_rect does not need to use an Fl_Overlay_Window object. That function is to be used with a normal Fl_Double_Window or Fl_Window. Its only purpose is to draw a dotted rectangle that can be easily deleted by any of 2 means :

1. draw another overlaid rectangle elsewhere (the previous one will be deleted)
   or
2. call fl_overlay_clear().

That kind of operation is visible in the mandelbrot test program of the FLTK source code.

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