observable properties and the css binding

I thought I'd cross post this question from StackOverflow.
http://stackoverflow.com/questions/15226336/kogrid-and-observable-properties.
"I'm looking at using KoGrid and it took me a while to figure out how to use observable properties. I found the wiki page about custom templates helpful and that I have to use $parent.entity['editableField']. However, I can't get the css binding to work."

It'd also be nice to have an example or more documentation on using the observable properties.

What I'm working on is at: http://plnkr.co/edit/hVjzwPaUVNm6mIVEEeA6

Thanks

Review the linked StackOverflow question, KoGrid wiki page on custom templates, and the provided Plunker example first. Reproduce the observable-property and CSS-binding behavior, then document the correct usage with a working example so users can tell how observable properties should be bound.

Written by the indexing model from the issue text.