Im try add flag in vehiclemeta but it dont work
That was my experience with it as well. Here's a thread about it (but with mixed results/info).
It's a total guess but I think there must be something that needs to be done in ZModeler to identify the glass as unbreakable/bulletproof & then that flag will work. I've not got round to using ZModeler yet so that's the limit of my knowledge on the subject.
Have a look through the site, find a mod author that has created a vehicle with bulletproof glass & ask them. This 5mods tailored Google search for 'bulletproof' will help you find one. That's your best bet on further info