System.ServiceModel 4.0.0.0 System.ServiceModel.Configuration.ServiceModelExtensionElement To be added. Represents a configuration element that contains sub-elements that specify behavior extensions, which enable the user to customize service or endpoint behaviors. Constructor 4.0.0.0 To be added. Initializes a new instance of the class. Property 4.0.0.0 System.Type To be added. To be added. Gets the type of behavior. Method 4.0.0.0 System.Object To be added. Creates a behavior extension based on the current configuration settings. The behavior extension.