How can I bring the standard P3D ATC window to sit above the 2D Main Panel? It appears OK in the VC but in the 2D it is layered below the main panel. Is there someway I can apply the equivalent of ZORDER as in the layering sequence in 2D panels. The ATC seems to work OK as does the 2D panels.

Not sure what you mean by ZORDER, but if you right click on the ATC window and select "undock window" you'll be able to move it to wherever you like.

Thanks, that does what I want, but didn't have to do that in FSX. Zorder is a configuration parameter in panel design.In the panel.cfg file for each window, zorder=2 overlays zorder=1 for two different 2D panels.