SharePoint 2010 – Taxonomyfield setting Allow Fill-in option programmatically

So I just spent a good few hours working on this one. I needed to programmatically set a field on a library to be a navigational key filter field with the option allow ‘fill-in’ = true. Talk about a painful ride. I finally figured it out though.

The taxonomyfield has a method called Open on it. Setting that to true will set the property allow fill-in to true as well. Whew. Hope this helps someone one day.

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