主题：分组统计汇总

Dim doc As New PrintDoc
Dim rx As New prt.RenderText
Dim rt As New prt.RenderTable
Dim Agg1 As New prt.DataBinding.Aggregate("数量小计")
Dim Agg2 As New prt.DataBinding.Aggregate("金额小计")

rt.Style.GridLines.All = New prt.Linedef(Color.Gray)
rt.CellStyle.Spacing.All = 1
rt.Cells(0,0).Text = "产品"
rt.Cells(0,1).Text = "数量"
rt.Cells(0,2).Text = "金额"
rt.Cells(1,0).Text = "[Fields!产品.Value]"
rt.Cells(1,1).Text = "[Aggregates!数量小计.Value]"
rt.Cells(1,2).Text = "[Aggregates!金额小计.Value]"

With rt.RowGroups(1,1)
    .DataBinding.DataSource = BindTables("订单")
    .DataBinding.Grouping.Expressions.Add("Fields!产品.Value")

    agg1.DataBinding = .DataBinding
    agg1.Running = 1
    agg1.ExpressionText = "Fields!数量.Value"
    doc.DataSchema.Aggregates.Add(agg1)

    agg2.DataBinding = .DataBinding
    agg2.Running = 1
    agg2.ExpressionText = "Fields!金额.Value"
    doc.DataSchema.Aggregates.Add(agg2)
End With

doc.body.Children.Add(rt)
doc.Preview()

怎么增加一行 统计  数量  金额