Clone in a terminal:
# data file for the Fltk User Interface Designer (fluid)
version 1.0300 
header_name {.hpp} 
code_name {.cpp}
widget_class PopupDialog {
  callback {o->hide();
Fl::delete_widget(o);} open selected
  xywh {51 115 165 55} type Double align 5
  class Fl_Window modal visible
} {} 

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