如何实现click　msflexgrid的column的caption，msflexgrid中的内容自动按caption排序？

如何实现click　msflexgrid的column的caption，msflexgrid中的内容自动按caption排序？Thanks!

先添加MSFlexGrid控件，方法：菜单－>工程－>部件－>Microsoft FlexGrid Control 6.0(后面为版本号），代码如下：

Option Explicit
Private Const STR_SORT_ASC = "△"
Private Const STR_SORT_DESC = "▽"
Private Sub Form_Load()
    Dim i As Long
   
    '添加一些试验数据
    With MSFlexGrid1
        .Rows = 51
        .Cols = 5
        For i = 0 To 50
            .TextMatrix(i, 0) = ("Col" & i)
            .TextMatrix(i, 1) = ("Col" & i)
            .TextMatrix(i, 2) = ("Col" & i)
            .TextMatrix(i, 3) = ("Col" & i)
            .TextMatrix(i, 4) = ("Col" & i)
        Next
    End With
End Sub
'排序函数
Public Sub Sort(sgrd As MSFlexGrid, y As Single)
    With sgrd
        If y >= .RowPos(0) And y < .RowPos(1) Then
            If .Tag <> "" Then
                If .Tag <> .Col Then
                    .TextMatrix(0, .Tag) = Left(.TextMatrix(0, .Tag), Len(.TextMatrix(0, .Tag)) - 1)
                End If
            End If
            
            If Right(.TextMatrix(0, .Col), 1) = STR_SORT_ASC Then
                .Sort = flexSortGenericAscending
                .TextMatrix(0, .Col) = Replace(.TextMatrix(0, .Col), STR_SORT_ASC, STR_SORT_DESC)
            ElseIf Right(.TextMatrix(0, .Col), 1) = STR_SORT_DESC Then
                .Sort = flexSortGenericDescending
                .TextMatrix(0, .Col) = Replace(.TextMatrix(0, .Col), STR_SORT_DESC, STR_SORT_ASC)
            Else
                .Sort = flexSortGenericDescending
                .TextMatrix(0, .Col) = .TextMatrix(0, .Col) & STR_SORT_ASC
            End If
            .Tag = .Col
        End If
    End With
End Sub
Private Sub MSFlexGrid1_MouseUp(Button As Integer, Shift As Integer, x As Single, y As Single)
    Sort MSFlexGrid1, y
End Sub

多谢版主！