As it happens, I did this myself today. Do you want TV Series to be separate from Recorded TV? I decided to do it this way. What I did is very similar to Sean's solution above. So, step by step:
Go to Tools > Options > Media Network > Advanced and select "Customise views for Gizmo and WebGizmo.
In the pop-up window, on the left, select Video. Click Add and choose Library Item.
In this window, change the name to TV Series.
To the right of this window, click Add and select Series. Click Add again and select Season. Click Add again and this time select Expression. Name the expression Program. In the Expression box, paste this: TVInfo(SeriesDisplay). The order in the box should be Series, Season, Program. If it isn't, drag them to the correct order.
Click OK to close all the windows and you are done. You will need to restart MC17 client and server (the server is found in the system tray, probably amongst your hidden icons).
Nick.