GcSpreadSheet1.CanUserUndo = true;
var group = new GrapeCity.Xaml.SpreadSheet.UI.UndoRedo.ColumnGroupExtent(3,5);
var action = new GrapeCity.Xaml.SpreadSheet.UI.UndoRedo.ColumnGroupUndoAction(GcSpreadSheet1.Sheets[0],group);
GcSpreadSheet1.DoCommand(action);
GcSpreadSheet1.CanUserUndo = True
Dim group As New GrapeCity.Xaml.SpreadSheet.UI.UndoRedo.ColumnGroupExtent(3,5)
Dim action As New GrapeCity.Xaml.SpreadSheet.UI.UndoRedo.ColumnGroupUndoAction(GcSpreadSheet1.Sheets(0),group)
GcSpreadSheet1.DoCommand(action)