We had need of a combobox at work and after looking around at the available options I was not happy with any of them. The project had all it's styling based on Twitter's Bootstrap, so building on that made sense.
I am looking for a new maintainer for this library if anyone is interested. I have changed jobs and no longer use it in any projects. It would be better served by being maintained by someone who uses it regularly. If you are interested let me know by commenting on this issue.
Then just activate the plugin on a normal select box(suggest having a blank option first):
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