Hi,
well I never tested it as an AU plugin. I´m aCubase user and as far as rendering goes never had a problem with a panel. Things do get messed up sometimes during design time though, when you copy-paste UI elements around, especially between tabs. I do like the tabs because you can keep things compact, but that´s a matter of taste. You could also use layers instead. Ctrl comes with a demo panel that shows you how to handle them…
Actually,
after having close and opened the panel again, everything’s up side down now, and i get a Lua error on line 18…
Well, the D-20 panel contains more than 20 scripts, so which line 18 are talking about 🙂 ?