Simulation controls panel weird behaviour when collapsing them

[albertinad]

When collapsing some control widget panel, the content is not collapsed/hided when its container is collapsed/hided. It does not always happens, it is randomly but easy to reproduce by toggling the panels.

I've tested on Chrome and Firefox. In Firefox works good but not in Chrome.

[dlebu]

This was fixed by removing the collapse/expand animation effect in #38

[albertinad]

Now works great, thanks!