DataGridTableStyle tableStyle = new DataGridTableStyle();
tableStyle.RowHeadersVisible = true;
tableStyle.RowHeaderWidth = 20;
DataGridBoolColumn fbool = new DataGridBoolColumn();
fbool.MappingName = "Sel";
fbool.HeaderText = "Sel";
fbool.Width = 50;
fbool.TrueValue = "true";
fbool.FalseValue = "false";
tableStyle.GridColumnStyles.Add(fbool);
Grid.TableStyles.Add(tableStyle);