class file_menu : public menubutton { 
\fbox{file_menu}
public: file_menu(widget* w, tablet* t) : c(t), menubutton(w,"file") {
(a)

configure("-relief sunken"); text("File"); pack("-side left"); f = new file_handler(c);
(b)

(c)

class menu* m = new class menu(this,"menu"); this->menu(m);
declares it for the menubutton

m->handler(this);
(d)

m->entry("Open"); m->entry("Save"); m->entry("Quit"); } int operator()() { if (!strcmp(argv[1],"Quit")) tk->quit();
(e)

else f->dispatch(tk,argc,argv); return OK; } protected: tablet* c; file_handler* f; };

slide: The {\em file\_menu}