Hi Will,

> Edit: Actually, an approach more consistent with typical UI would be to immediately change
> the entire content of the pane to a progress view.

Sounds pretty good, but one complication is that there are also many commands that need to show some kind of an "in progress" indicator (like "Calculating..." does currently) while you're still inside the command, for commands that have options that you can adjust before finishing the command. Like for example the Fillet command lets you enter in a radius and then starts off the calculation, but when the calculation is finished you're still in the fillet command and can change the radius again (and get "Calculating..." again) before you actually finish the command.

That's why the current "Calculating..." mechanism is more like something that gets added in to whatever UI is currently showing rather than only being a final screen.

- Michael