主题：增加多个临时列后，最后列设置标题无效

Dim i As Integer
Dim dt As DataTable = DataTables("表C")
Dim dc As DataCol
For i = 0 To 5
    dc =dt.DataCols.add("fu" &i, Gettype(String), 255) '新增列
    Tables(dt.name).Cols(dc.name).Width = 70 '设列宽
    Tables(dt.name).Cols(dc.name).Caption = "FoxTable-" & i '设标题名称
    Tables(dt.name).SetHeaderCellBackColor(dc.name,color.MediumSlateBlue) '设标题颜色
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