The extent of the GeoDataset.
[Visual Basic 6.0] Property Extent As IEnvelope
[Visual Basic .NET] Public ReadOnly Property Extent As IEnvelope
[C#] public IEnvelope Extent {get;}
[Java] public IEnvelope getExtent() throws IOException, AutomationException
[C++] HRESULT get_Extent( IEnvelope** Extent );
ESRI's GroupLayer implements this property differently from most other layer coclasses. When you instantiate a new GroupLayer, this property will return a valid envelope with zero height and width. With most other newly instantiated layers (for example FeatureLayer, RasterLayer, TinLayer), this property initally returns Nothing.