protected virtual void OnErrorsChanged(
	string propertyName = null
)

Protected Overridable Sub OnErrorsChanged ( 
	Optional propertyName As String = Nothing
)

protected:
virtual void OnErrorsChanged(
	String^ propertyName = nullptr
)

abstract OnErrorsChanged : 
        ?propertyName : string 
(* Defaults:
        let _propertyName = defaultArg propertyName null
*)
-> unit 
override OnErrorsChanged : 
        ?propertyName : string 
(* Defaults:
        let _propertyName = defaultArg propertyName null
*)
-> unit