API Question

I am working in a small application to monitor and control several parameters on my 6600M.  I'm using C# and Visual Studio 2019.  I've been successful in setting up event handlers to monitor property changes on the active slice and panadapter , and I have been able to control /monitor properties associated with the active slice, like selection of the TX and RX antennas, frequency, etc.  My problem is in trying to get and set RFGain, which is associated with the Panadapter class of the API.  My code successfully detects the change of this parameter if I change it from the front panel of the radio, but I can't figure out how to read the changed value, or change the setting myself.  I've had no problem getting and setting properties in the Slice class using:

_thisRadio.ActiveSlice.RXAnt = "ANT1";  for example,

but I'm not clear how to reference the Panadapter associated with the ActiveSlice.

Most of my code is based on the example code found elsewhere in this community, but I am a rookie C#'er, so I am very likely missing something simple.

Thanks and 73,

Phil  K9UC