Select layer on which the operation will be performed. It is important for project files. Thanks this it is possible to recognize which entry corespondents to which layer.
// C# public virtual abstract void SetGroup( TObject _layer );
' VisualBasic Public Overridable MustOverride Sub SetGroup( ByVal _layer As TObject )
// Oxygene public procedure SetGroup( _layer : TObject ); virtual; abstract;
|_layer||TObject||layer on which the operation will be performed; it is nil then operation will be performed on main entry ([TatukGIS] section)|