text: #ifndef GTKMM_EXAMPLE_Window_H
  #define GTKMM_EXAMPLE_Window_H
  
  #include <gtkmm/button.h>
  #include <gtkmm/window.h>
  
  class Window : public Gtk::Window
  {
  
  public:
    Window();
    virtual ~Window();
  
  protected:
    //Signal handlers:
    void on_button_clicked();
  
    //Member widgets:
    Gtk::Button m_button;
  };
  
  #endif // GTKMM_EXAMPLE_Window_H
  