public static void Callback(object userData, string[] options, int selected) { AuthorChHit authorChHit = userData as AuthorChHit; switch (selected) { case 1: { authorChHit.AddHingeJoint(); break; } case 2: { authorChHit.AddCharacterJoint(); break; } case 3: { authorChHit.AddFixedJoint(); break; } case 4: { authorChHit.AddSpringJoint(); break; } } }