set sub report height

[iccsi]

I have sub report on the main report and would like to set the height
to zero and invisible when there is no record in the sub report.


I tried to set all controls to can shrink and height to zero when
there is no record, but it seems the sub control invisible, but still
has some space blank on the sub report spot.


Are there any solution to set sub report height zero when there is no
record for the sub report?


Your help is great appreciated,