Hello PolymerElements Team,
this is a proposal to resolve the fact that we can't set color property programmatically and get the color container selected-item updated. Changes are :

• use a dataset : data-color attached to the item color, so _rgbToHex is not need anymore and is move in test.
• set the container selected/index to the color index.
• default to black if no color
• add related tests

this should close #10
Regards,
Cyrille.