I asked this early, but maybe somebody find way how to do this

 if (sub.GetTypeName2() == "GeneralTableFeature")
                    {
                        bool selected = sub.Select(false); //return true
                        GeneralTableFeature genTable = (GeneralTableFeature)model.ISelectionManager.GetSelectedObject6(1, -1);
                        model.ClearSelection2(true);
                        TableAnnotation ooo = (TableAnnotation)genTable.GetTableAnnotations()[0];
                        Annotation ann = ooo.GetAnnotation();
                        ann.Select(false); //return true
                        var isRun = swApp.RunCommand((int)swCommands_e.swCommands_FitText, ""); //return true
                        model.ClearSelection2(true);
                    }//

But method do nothing. All cells wich have extended text - stay with extended text.

Maybe this problem has a different solution?