Public Property Item( _
    ByVal Index As Integer _
) As 

public IAgTerrain this[
    int Index
] {get;}

public: __property IAgTerrain^ get_Item(
    int Index
);

public: HRESULT get_Item(
    long Index,
    IAgTerrain* ppVal
);

public IAgTerrain getItem(
    int Index
);