protected virtual void OnSet(
	int index,
	T oldValue,
	T newValue
)

Protected Overridable Sub OnSet ( 
	index As Integer,
	oldValue As T,
	newValue As T
)

protected:
virtual void OnSet(
	int index, 
	T oldValue, 
	T newValue
)

abstract OnSet : 
        index : int * 
        oldValue : 'T * 
        newValue : 'T -> unit 
override OnSet : 
        index : int * 
        oldValue : 'T * 
        newValue : 'T -> unit