How to find the height of growing subform

Hi Experts,
I am trying to find the height of growing subform at runtime. But I could'nt is there any way i can find it.
I am using the below formcalc script in the event layout read.
<variable>.Value = Subform.h
all the time i get the value as 0.
Regards,
Krishna

Hello Otto,
Thanks for your suggestion, couple of days back I used one of the layout methods to find the height of the growing subform.
this.RawValue = xfa.layout.h(<subform>, 'mm');
The above javascript code works in the event "Calculate" and in event "Layout ready" all the other events is returning the height as '-1'.
Basicaly I have two bodypages as shown below my requirement is to find the height of a subform in first bodypage and if it reaches a particular height I want to insert a page break using conditional break in SUBFORM2.
PAGE1
      - SUBFORM1(Bodypage1)-> ContentArea1
      - SUBFORM2(Bodypage2)-> ContentArea2
Condtional break code on SUBFORM2.
Height > 80
Break Before "X"    Goto top of Content Area <ContentArea2>
Unfortunately the conditional page break is not working now so trying hard to find a solution to it, please let me know if you have any suggestions here.
Thanks,
Krishna

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