Is it possible to add new attributes to certain shapes based on their type?

Is it possible to add new attributes to certain shapes based on their type?

An example for this would be associating an Age and Gender property if the shape under consideration happens to be of type Person.

Essential Diagram implements a property model that supports late-binding and run-time inheritance that makes it very simple for adding/removing properties at run-time. This property model, implemented through the Diagram.IPropertyContainer interface, defines methods for storing, retrieving, adding, removing and enumerating the property values of objects without the need for compile-time knowledge of the object type.