How to use USER_1&2 modelcondition trigger? Options

[A34Comet]

I once think it is nothing difference with using normal condition tag, but I found it not working good(triggered by a general upgrade), including:
*only triggered on existing units when the general upgrade is done, and units produced after the upgrade dont get model condition upgrade
*always show upgraded model condition, even the trigger upgrade is not finished

Since I also have subobejects on turret, I cant just use another W3dmodel. I see hopper tank and internet center works fine, but I dont really understand why from its code. Anyone can answer me this question?
I wrote like this :

conditionstate = NONE
HideSubobject= A B C
...

conditionstate = REALLYDAMAGED
HideSubobject= A B C
...

conditionstate = RUBBLE
HideSubobject= A B C
...

conditionstate = USER_1
ShowSubobject= A B C
...

conditionstate = USER_1 REALLYDAMAGED
ShowSubobject= A B C
...

conditionstate = USER_1 RUBBLE
ShowSubobject= A B C
...