In order for a property associated with a component object to be included in the property sheet for that component, the property must be registered. The property registration mechanism accomplishes several things:

• It allows you to expose as many or as few of the properties of an underlying object as you choose.
• It allows you to add user-defined properties to existing objects, and expose those new properties to users of your application.

Groups of properties of graphical atomic objects can be registered by setting their REGISTER_PROPERTIES properties to True when the object is initialized. See the property tables for each graphical atomic object.