This class derives from the MSPluginClass which in turn derives from the MAXClass. Custom Attributes are instances of this class.
Read-only Boolean property. Always returns True since Custom Attributes use ParamBlock2. This property is also available in MAXClass and MSPluginClass.
Read-only property of custom attribute definition. Also available in MAXClass, and MSPluginClass. SinceMSPluginClass derives from MAXClass, and MSCustAttribDef derives from MSPluginClass, the property always returns True for custom attribute definitions.
A read-only property, always true for custom attribute definitions. Also available in MAXClass and MSPluginClass.
<MSCustAttribDef>.version
NEW in 3ds Max 2015: A read-only property of custom attribute definition. Also available in MSPluginClass. The property contains the version of the custom attribute definitions.