Button vs. Message box scripts; P.S. Invert matrices?

[Jim Hurley]

Now here's a funny thing:

I ran the following single line in the msg box:

revrotatepoly graphic "MyPoly", 90

and sure enough, the graphic "MyPoly" rotated 90 degrees.

But the button handler:

On mouseUp
revrotatepoly graphic "MyPoly", 90
end mouseUp

return an error: "Chunk source is not a container."

Why is it that the msg box can find the graphic but the button cannot?

Jim

P.S. I don't suppose anyone has a routine to invert matrices?