Gridview needs to call different subs at rowlevel

I have a gridview. The rows consist of a buttonfield and a hyperlinkfield.
When clicking on the Buttonfield <asp:ButtonField ButtonType="link" CommandName="CT_Key" Text="Edit" />  it needs to call Protected Sub CompleteGridview1_RowCommand

When clicking on the hyperlinkfield <asp:CommandField ShowSelectButton="True" SelectText="View Manifest"
                            SortExpression="File" HeaderText="Manifest" /> it needs to call Protected Sub CompleteGridview1_selectedindexchanged.

As of now both fields go straigh to Protected Sub CompleteGridview1_RowCommand. How can I avoid this?

<asp:CompleteGridView ID="CompleteGridView1" DataKeyNames="CT_Key" 
                    runat="server" CellPadding="4" DataSourceID="sdsMetrics"
                    ForeColor="#333333" GridLines="None" AllowSorting="True" AutoGenerateColumns="False"
                    ShowFilter="True" ShowFooter="True" OnLoad="MyOnLoadHandler" Width="950px" 
                    ShowUnselect="True" CssClass="form" AllowPaging="True" 
                    OnRowDataBound="DataGrid1_RowDataBound" SortAscendingImageUrl="" 
                    SortDescendingImageUrl="">
                    <Columns>
                         <asp:ButtonField ButtonType="link" CommandName="CT_Key" Text="Edit" /> 
                        <asp:BoundField DataField="CT_Key" HeaderText="CT_Key" InsertVisible="False" ReadOnly="True"
                            SortExpression="CT_Key" Visible="False" />
                        <asp:BoundField DataField="CT_Date" HeaderText="CT Date" SortExpression="CT_Date" />
                        <asp:BoundField DataField="Ship_Origin" HeaderText="Ship Origin" SortExpression="Ship_Origin" />
                        <asp:BoundField DataField="Trailer_nbr" HeaderText="Trailer Nbr" SortExpression="Trailer_nbr" />
                        <asp:BoundField DataField="Pull_request" HeaderText="Pull Request" SortExpression="Pull_request" />
                        <asp:BoundField DataField="Pull_Req_Time" HeaderText="Pull Req Time" SortExpression="Pull_Req_Time" />
                        <asp:BoundField DataField="Pull_Req_Time_Two" HeaderText="Pull Req Time" SortExpression="Pull_Req_Time_Two" />
                        <asp:BoundField DataField="Pull_Req_Time_Three" HeaderText="Pull Req Time" SortExpression="Pull_Req_Time_Three" />
                        <asp:BoundField DataField="Pull_Req_Time_Four" HeaderText="Pull Req Time" SortExpression="Pull_Req_Time_Four" />                        
                        <asp:BoundField DataField="Fill_Rate" HeaderText="Fill Rate" SortExpression="Fill_Rate" />
                        <asp:BoundField DataField="Driver_Depart_Time" HeaderText="Driver Depart Time" SortExpression="Driver_Depart_Time" />
                        <asp:BoundField DataField="Customs_Time" HeaderText="Customs Time" SortExpression="Customs_Time" />
                        <asp:BoundField DataField="Border_Depart" HeaderText="Border Depart" SortExpression="Border_Depart" />
                        <asp:BoundField DataField="Trailer_Arriv_Time" HeaderText="Trailer Arriv" SortExpression="Trailer_Arriv_Time" />
                        <asp:BoundField DataField="Cycle_Time" HeaderText="Cycle Time" SortExpression="Cycle_Time" />
                        <asp:CommandField ShowSelectButton="True" SelectText="View Manifest" 
                            SortExpression="File" HeaderText="Manifest" />
                    </Columns>

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Protected Sub CompleteGridview1_selectedindexchanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CompleteGridView1.SelectedIndexChanged
        Dim conString As String = ConfigurationManager.ConnectionStrings("BusDevConnectionString").ToString
        Dim objConn As SqlConnection = New SqlConnection(conString)
        Dim rdr As SqlDataReader
        Dim sqlstr As String

        Dim myCommandDV As SqlDataAdapter = New SqlDataAdapter
        Dim strID As String
        objConn.Open()
        strID = CompleteGridView1.SelectedValue

        sqlstr = "select [File] from Cycle_Time where  CT_Key='" & strID & "'"

        Dim cmd = New SqlCommand(sqlstr, objConn)

        Dim result As Byte() = Nothing

        rdr = cmd.ExecuteReader()
        If rdr.HasRows Then
            rdr.Read()
            Response.Clear()
            Response.ContentType = "application/vnd.ms-excel"
            Response.BinaryWrite(CType(rdr("File"), Byte()))
            Response.End()
        End If

       


    End Sub


    Protected Sub CompleteGridview1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles CompleteGridView1.RowCommand
        Dim currentRowIndex As Integer = Int32.Parse(e.CommandArgument)

        Dim ProductID As String = CompleteGridView1.DataKeys(currentRowIndex).Value
        If Roles.IsUserInRole(Membership.GetUser.UserName.ToString, "ELP_Transport") Then
            Response.Redirect("~/Foxconn/CT_Transport/Metrics_Detail_Transport.aspx?Key=" & ProductID & "")
        Else
            Response.Redirect(String.Format("~/Foxconn/CT/Metrics_Detail.aspx?Key={0}", ProductID))
        End If

    End Sub

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