[Pharo-dev] How can I create a trivial "spinner" etc, to see if image is busy?

[Yuriy Tymchuk]

Hi all,

is there an easy was to do some thing that is constantly changing? so if my 
image freezes (to export a 1gb ston file for example) I can see when it’s done. 
   Or maybe there is a way to send a mac notification from Pharo?

Cheers.
Uko