VC gauges

Does anyone know why gauges should appear differently in the 2D and virtual cockpits?Examples - MFD in the 747 has the knobs used to tune EICAS 1 & 2. They don't exist in the VC even though the gauge names are the same in the panel.cfg. Also, the autopilot cmd switch works in the 2D, but not the VC. This knob problem also exists in the Caravan. You can't tune the OBS2 or the altimeter.Importing the FS9 default 777 has a similar problem. The MFD appears and is functional in the 2D cockpit, but appears and is not functional in the VC. It's just a black screen.I've looked at the panels in FSPanel, and they appear to be the same. Odd though, if you select edit gauge the knobs don't appear there either. I haven't found and entry to add the knobs.Very puzzling.Thanks.