Transparency

Hi guys,

I started the conversion from v3.5a to 4.1 and in doing that I went through the busbar example. I have an annoying problem though. I can't switch on the transparency to see through the air domain. I mean, I can click on the transparency button but almost nothing happens. I say almost since in the upper corner some lines are drawn, but no transparency at all appears.

Any idea?

Thanks a lot in advance!

J