mschart 饼图的问题

[when]

我用mschart画饼图
要求按百分比显示
如下程序：我要用一个饼按百分比显示
Dim ChartData(1 To 3, 1 To 2) As String
Dim intCount As Integer
ChartData(1, 1) = "一月份"
ChartData(2, 1) = "二月份"
ChartData(3, 1) = "三月份"

ChartData(1, 2) = "10"
ChartData(2, 2) = "50"
ChartData(3, 2) = "40"

MSChart1.ChartType = VtChChartType2dPie

MSChart1.ChartData = ChartData

可是运行的时候显示3个大小不同的饼
这是怎么回事啊
老大指点一下