SignalTap Display Rows Modification

I am using SignalTap with Quartus 12.1, and have several clusters of signals that are closely related. What I am wondering is whether it is possible to insert a blank row between these clusters of signals, similar to in Aldec or Modelsim? Although I have used SignalTap many years, I haven't had the need for this function in the past, and seem unable to find it if it does exist. Thanks. James