Problem - Alpha transparency in dynamics objects

yes, is a car, but the question is in "map objects"

i make a car and used the attached's objects on it, like eletric windows, but the windows have transparency and depending of position of camera, the windows don't shows the dynamics objects (ped, weapon and car) only objects of map, look:

(the steer, engine fan, speed indicator and gear knob is others objects attacheds with car)

i used the flag "alpha transparency" 1 and 2, and the two together, but not had success
the transparency is in the proper model and not in .txd with mask/alpha (because in some PC's in this way did not work, the part was all invisible)

there a way to fix and make the part to show dynamic objects with flags, or otherwise?
(more details of this car here)