Im making elevator to my hl2dm map. I have 4 ropes, 4 lengthconstraints and physbox as floor. I made little pole brush and parented it to the floor (pole is physbox too). Then i put prop_dynamic with "keypad" model selected and parented it to the pole. When i test my map (the elevator is still not functional, it just hangs from the ropes) the pole and keypad are not there. What i need to do?