class file_menu : public menubutton { 
    
    public:
      file_menu(widget* w, tablet* t) : c(t), menubutton(w,"file") { 
    
        configure("-relief sunken"); text("File"); pack("-side left"); 
  
        f = new file_handler(c);   // create a file_handler
    
        class menu* m = new class menu(this,"menu"); 
        this->menu(m);             // declares it for the menubutton
        m->bind(this);             // installs this as the handler
    
        m->entry("Open");
        m->entry("Save");
        m->entry("Quit");
      }
    
      int operator()() { 
  
    	if (!strcmp( _event->arg(1),"Quit")) tk->quit(); 
    	else f->dispatch( _event ); // transfer to file_handler
    	return OK;
      }
  
    protected:
      tablet* c;
      file_handler* f;
    };
  

slide: The file_menu class