3 state checkbox in customtreectrl

First, thanks to Andrea for the customtreectrl widget!

I see mention of a 3-state checkbox in the TODO list (and a question if
that's really useful). I'd very much like to have such a thing, and
before going ahead and trampling over the code, I'm wondering if anyone
already has done this, or has partially implemented it.

Thanks,
Anthony.

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Anthony Floyd, PhD
Convergent Manufacturing Technologies Inc.
6190 Agronomy Rd, Suite 403
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Email: Anthony.Floyd@convergent.ca | Tel: 604-822-9682
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