+
+ /* Add a menu. They have their own context and should thus work with forward compatible main windows too. */
+ menuA = glutCreateMenu(samplemenu);\r
+ glutAddMenuEntry("Sub menu A1 (01)",1);\r
+ glutAddMenuEntry("Sub menu A2 (02)",2);\r
+ glutAddMenuEntry("Sub menu A3 (03)",3);
+ glutSetMenu(menuA);\r
+ glutAttachMenu(GLUT_RIGHT_BUTTON);
+