Animation example source code?

[spdegabrielle at gmail.com]

> An exercise for you would be to create some buttons that do these method calls
 > (start, stop, addAnAtom) when clicked. You can them embed those buttons in a
 > row morph. Then embed that row morph and the gas tank in a column morph to
 > get a single "Gas Tank" widget with controls. 
 

 I'm sure one of the videos on self show this  - does anyone know which one and at what time in the video it is shown?
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