| Class | Description | 
|---|---|
| AbstractRegistryEventListener | Abstract utility class to listen to the  IExtensionRegistry. | 
| PluginClassDescriptor<T> | Simple utility class to create proxy of extension that are
  instantiable. | 
| Enum | Description | 
|---|---|
| AbstractRegistryEventListener.Action | Enumeration that says if the  IConfigurationElementis to be added or removed from theIExtensionRegistry. | 
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