UltraWebGrid单元格横向跨列

var row = GridEvaluationGrade.Rows[GridEvaluationGrade.Rows.Count - 1];
row.Cells[0].ColSpan = 3;
row.Cells[1].ColSpan = 0;
row.Cells[2].ColSpan = 0;
row.Cells[0].Text = "总分";
row.Cells[0].Style.HorizontalAlign = HorizontalAlign.Center;
GridEvaluationGrade.Columns[5].HTMLEncodeContent = false;
row.Cells[5].Value = "<button onclick='alert(\"x\");'>TEST</button>";