text: #ifndef GTKMM_EXAMPLE_HELLOWORLD_H
  #define GTKMM_EXAMPLE_HELLOWORLD_H
  
  #include <gtkmm/fixed.h>
  #include <gtkmm/button.h>
  #include <gtkmm/window.h>
  #include <gtkmm/textview.h>
  #include <gtkmm/scrolledwindow.h>
  #include <gtkmm/drawingarea.h>
  #include <gtkmm/label.h>
  
  #include "BallsView.h"
  
  
  class HelloBallWindow : public Gtk::Window
  {
  
  public:
    HelloBallWindow();
    virtual ~HelloBallWindow();
  
    Gtk::Fixed fixed;
    Gtk::Button executeButton;
    Gtk::ScrolledWindow inputScroll;
    Gtk::TextView inputText;
    Gtk::ScrolledWindow outputScroll;
    Gtk::TextView outputText;
    BallsView ballsArea;
    Gtk::Label epsLabel;
  };
  
  #endif // GTKMM_EXAMPLE_HELLOWORLD_H
  