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ChartGroups are organized into the ChartGroupsCollection, which is accessed through the ChartGroups object.
To write code in Visual Basic
c1Chart3D1.ChartGroups.ChartGroupsCollection[0]
To write code in C#
c1Chart3D1.ChartGroups.ChartGroupsCollection[0];
Also, as with the 2D chart, the access path can be shortened.
To write code in Visual Basic
c1Chart3D1.ChartGroups.Group0
To write code in C#
c1Chart3D1.ChartGroups.Group0;
Properties can be accessed directly from the group as with 2D chart.