[Newbies] Is there an easy way to implement an animation loop?

[Jan Teske]

Hi there,

I try to implement a blocking animation so that the process waits for 
the animation to be terminated before going ahead. This animation should 
lower the extent of a Morph in 20 iterations so that it looks like it 
would shrink.

I tried to accomplish that in a '1 to: 20 do:' loop but the Morph is not 
updated during the iterations. I tried 'morph changed' but that doesn't 
work either. It does work, however, if I fork the animation loop. But 
than I have an extra process an need Semaphores to wait for its 
execution. That's not as simple as it could be.

Is there any better way than fork and Semaphore? Maybe some force redraw 
method I have overlooked?

Thanks in advance!