gcSpreadSheet1.Sheets[0].NamedStyles.Add(new GrapeCity.Windows.SpreadSheet.Data.StyleInfo() { Background = new SolidColorBrush(Colors.Red), Name = "aaa", VerticalAlignment = GrapeCity.Windows.SpreadSheet.Data.CellVerticalAlignment.Center} );
gcSpreadSheet1.Sheets[0].NamedStyles.Add(new GrapeCity.Windows.SpreadSheet.Data.StyleInfo() { Background = new SolidColorBrush(Colors.Blue), Name = "ParentStyle", TextIndent = 5});
gcSpreadSheet1.Sheets[0].Cells[0, 0].StyleName = "aaa";
gcSpreadSheet1.Sheets[0].Cells[0, 0].ParentStyleName = "ParentStyle";
gcSpreadSheet1.Invalidate();