I can confirm that it is a custom data type. As Manuel says, you would need to contact Insydium support about this but I'm not sure the definition of the data type and the GUI is contained in the third-party library they make available. If not, I'm afraid you're out of luck.
Try using the ObjectColorProperties like so:
ocp.xray = true;
If you go to the 'Read before posting' page and click the 'About Tags and Tagging' link, you get a page not found error.