Here you go.
It's not quite a drop-in from what you describe. The system dialog is modal and I believe it centers on screen, opposed to the LabVIEW color picker which can be made appear more like a context menu. The modality likely helps though since dismissal is automatically handled.
Hope it helps.
m
Edit: this source code is released to the public domain, blah blah blah.
.NET Color Picker 2013.vi
I've bookmarked this one a while back.
https://decibel.ni.com/content/servlet/JiveServlet/previewBody/22385-102-3-42676/LabVIEW%20VI%20Dimensional%20Model.pdf
Not sure if the same properties also apply to BD
Another option is basically grabbing the image off of the LV color picker and using that as your source. I posted an example here - http://forums.ni.com/t5/LabVIEW/Using-LabView-s-Color-Picker/m-p/576129#M270051
Hi guys, I haven't been here for a long time...
I'd like to show you what I'm very proud of:
http://www.esa.int/Our_Activities/Space_Engineering_Technology/Clean_Space/Want_to_snag_a_satellite_Try_a_net
The guy in the left side of the cabin is me
LabVIEW is of course extensively involved.