Sorry you were unable to open the example. What error did you get? In any case, I am attaching a screenshot of the block diagram of the example that I sent that shows how you can put the waterfall in the subpanel. The actual waterfall display is a VI that is called dynamically by the SVT Waterfall VIs. The VI is called svl_Waterfall Display.vi, and a reference to this VI is already returned by the Initialize Waterfall VI.
Doug
Enthusiast for LabVIEW, DAQmx, and Sound and Vibration