On 2012-Feb-5, at 7:40 , Bob Arning wrote:

Look at the methods #wantsSteps.

Bingo! I assumed it was something stupid I was missing. On 2012-Feb-4, at 14:23 , Sean P. DeNigris wrote:

I don't know if it's any better, but when I create my own morph-in-a-window, I usually don't subclass SystemWindow, but add my morph to a window using openInWindowLabelled: or addMorph:fullFrame:. I feel like I have a little more flexibility if I later want to use it not-in-a-window.

After defining wantsSteos, I see that color: seems to work a bit strangely too in SystemWindow, so I'm going to try this. Thanks, Bob and Sean.