Move PhetioGroup instantiations to subclasses

phetsims / charges-and-fields

"Charges And Fields" is an educational simulation in HTML5, by PhET Interactive Simulations.

GNU General Public License v3.0

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Move PhetioGroup instantiations to subclasses #179

Open zepumph opened 4 years ago

zepumph commented 4 years ago

@pixelzoom did this in Natural Selection (see BunnyGroup.js), and it looks really nice. Let's do this in CAF since CAF is becoming an exemplar for dynamic elements.