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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.
Steve
Try using the ObjectColorProperties like so:
BaseObject *obj; ObjectColorProperties ocp; obj->GetColorProperties(&ocp); ocp.xray = true; obj->SetColorProperties(&ocp);
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