[Newbies] isStepping question

If I have a morph that is stepping through some process I know I can test for whether or not it is still stepping by using the isStepping method. But, how to I put this into a loop so that the next instruction doesn't start until the stepping is done.

Here is my mouseDown code. I want to put something in before the last instruction so it doesn't execute until isStepping becomes false.

mouseDown: evt

path := OrderedCollection new.

0 to: 9 do: [:i | path add: self position + (0@(10 * i))].

path := path, path reversed.

self startStepping.

self owner moveTheGameBall.