Protected Friend Property Item ( _
    propertyName As String _
) As Object

Dim propertyName As String
Dim value As Object

value = Me.Item(propertyName)

Me.Item(propertyName) = value

protected internal Object Item[
    string propertyName
] { get; set; }

protected public:
property Object^ Item[String^ propertyName] {
    Object^ get (String^ propertyName);
    void set (String^ propertyName, Object^ value);
}

/** @property */
protected Object get_Item(
    String propertyName
)
/** @property */
protected  void set_Item(Object value)

JScript does not support indexed properties.