public double SelectionOpacity {get; set;}

public void CreateGeneralCell4()
{
GeneralCellType generalCellType1 = new GeneralCellType();

//Enter edit status, select some text, the selection background will be Red.
generalCellType1.SelectionBrush = new SolidColorBrush(Colors.Red);
generalCellType1.SelectionOpacity = 0.6;

generalCellType1.TextWrapping = System.Windows.TextWrapping.Wrap;

this._gcSpreadGrid1[0, 0].CellType = generalCellType1;
}