radgrid combobox javascript filter not working after filtering first time

[Don]

My combobox filter only works the first time it is selected.
I am using the same user control on the page multiple times so I need a unique javascript function name

<telerik:RadGrid ID="grvProjectSummary" runat="server"
    AllowAutomaticDeletes="True" AllowFilteringByColumn="True" AllowPaging="True"
    AllowSorting="True" AutoGenerateColumns="False" CellSpacing="0"
    CssClass="eGrantsGroupBox" GridLines="None"
    PageSize="25" Skin="Office2010Blue" Width="100%">
    <HeaderStyle CssClass="eGrantsGridHeader" />
    <ItemStyle CssClass="eGrantsTableRow" />
    <AlternatingItemStyle CssClass="eGrantsTableAltRow" />
    <GroupingSettings CaseSensitive="false" />
    <MasterTableView CommandItemDisplay="Bottom" DataKeyNames="GrantProjectPK, AgencyFK"
        ShowHeadersWhenNoRecords="true" TableLayout="Fixed">
        <CommandItemSettings ExportToPdfText="Export to PDF"
            ShowAddNewRecordButton="False" ShowExportToCsvButton="True"
            ShowExportToExcelButton="True" ShowExportToPdfButton="True"
            ShowExportToWordButton="True" ShowRefreshButton="True" />
        <RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">
        </RowIndicatorColumn>
        <ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">
        </ExpandCollapseColumn>
        <Columns>

            <telerik:GridNumericColumn Aggregate="Count" AllowFiltering="False"
                DataField="GrantProjectPK" DecimalDigits="2"
                FilterControlAltText="Filter GrantProjectPKColumn column" HeaderText="&nbsp;"
                ReadOnly="True" ShowFilterIcon="False" SortExpression="GrantProjectPK"
                UniqueName="GrantProjectPKColumn">
                <HeaderStyle Width="40px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="40px" />
            </telerik:GridNumericColumn>

            <telerik:GridBoundColumn AutoPostBackOnFilter="true" Visible="true"
                CurrentFilterFunction="Contains" DataField="AgencyName"
                FilterControlWidth="100px" HeaderText="Agency/LEA" ShowFilterIcon="true"
                SortExpression="AgencyName"
                UniqueName="AgencyNameColumn">
                <HeaderStyle HorizontalAlign="Left" Width="180px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="180px" />
            </telerik:GridBoundColumn>

            <telerik:GridBoundColumn AutoPostBackOnFilter="true" Visible="false"
                CurrentFilterFunction="Contains" DataField="GrantProgramTypeTitle"
                FilterControlWidth="60px" HeaderText="Program Title" ShowFilterIcon="true"
                SortExpression="GrantProgramTypeTitle"
                UniqueName="GrantProgramTypeTitleColumn">
                <HeaderStyle HorizontalAlign="Left" Width="180px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="180px" />
            </telerik:GridBoundColumn>

            <telerik:GridBoundColumn UniqueName="columnAUNumber" AutoPostBackOnFilter="true"
                ReadOnly="true" CurrentFilterFunction="Contains" DataField="AUNumber" HeaderText="AUN"
                ShowFilterIcon="true" SortExpression="AUNumber" FilterControlWidth="60px">
                <HeaderStyle Width="100px"></HeaderStyle>
                <ItemStyle Width="100px" HorizontalAlign="Left" />
            </telerik:GridBoundColumn>

            <telerik:GridTemplateColumn DataField="StepName" HeaderText="Workflow Step" UniqueName="StepName" SortExpression="StepName">
                <HeaderStyle HorizontalAlign="Left" Width="120px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="120px" />
                <FilterTemplate>
                    <telerik:RadComboBox ID="rcmbStepFilter" DataSourceID="SqlDataSource3" Width="110px" Skin="Office2010Blue"
                        DataTextField="StepName"
                        DataValueField="StepName" AppendDataBoundItems="true"
                        SelectedValue='<%# TryCast(Container, GridItem).OwnerTableView.GetColumn("StepName").CurrentFilterValue%>'
                        runat="server">
                        <Items>
                            <telerik:RadComboBoxItem />
                        </Items>
                    </telerik:RadComboBox>
                    <telerik:RadScriptBlock ID="RadScriptBlock2" runat="server">
                        <script type="text/javascript">
                            function SelectedIndexChanged_<%= ClientID %>(sender, args) {
                                var tableView = $find("<%# TryCast(Container, GridItem).OwnerTableView.ClientID %>");
                                tableView.filter("StepName", args.get_item().get_value(), "EqualTo");
                            }
                        </script>
                    </telerik:RadScriptBlock>
                </FilterTemplate>
                <ItemTemplate>
                    <%# Eval("StepName")%>
                </ItemTemplate>
            </telerik:GridTemplateColumn>

            <telerik:GridDateTimeColumn UniqueName="columnSubmitDate"
                DataField="SubmitDate.date" HeaderText="Submit Date" FilterControlWidth="80px"
                SortExpression="SubmitDate.date" DataType="System.DateTime" DataFormatString="{0:MM/dd/yyyy}"
                ShowFilterIcon="true" CurrentFilterFunction="EqualTo">
                <HeaderStyle HorizontalAlign="Left" Width="120px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="120px" />
            </telerik:GridDateTimeColumn>
                        
            <telerik:GridBoundColumn AutoPostBackOnFilter="true"
                CurrentFilterFunction="Contains" DataField="LastName" AllowFiltering="false"
                FilterControlWidth="60px" EmptyDataText="Unassigned"
                HeaderText="Assigned To" ShowFilterIcon="false" SortExpression="LastName"
                UniqueName="AssignedToColumn">
                <HeaderStyle HorizontalAlign="Left" Width="100px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="100px" />
            </telerik:GridBoundColumn>

            <telerik:GridButtonColumn UniqueName="SelectCommandColumnNoAjax"
                ButtonType="ImageButton" Text="Assign Reviewers"
                ImageUrl="~/images/users_add.png"
                CommandArgument="" CommandName="AssignUsers"
                ItemStyle-HorizontalAlign="Center">
                <HeaderStyle Width="40px"></HeaderStyle>
                <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="40px"></ItemStyle>
            </telerik:GridButtonColumn>

            <telerik:GridButtonColumn ButtonType="ImageButton" CommandArgument=""
                CommandName="SEL" ImageUrl="~/images/select_program_sm.gif" Text="View Program"
                UniqueName="SelectCommandColumn">
                <HeaderStyle Width="40px" />
                <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="40px" />
            </telerik:GridButtonColumn>

            <telerik:GridButtonColumn ButtonType="ImageButton" CommandArgument=""
                CommandName="REVIEW" ImageUrl="~/images/review.png" Text="Review"
                UniqueName="ReviewCommandColumn">
                <HeaderStyle Width="40px" />
                <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Width="40px" />
            </telerik:GridButtonColumn>

            <telerik:GridNumericColumn Aggregate="Count" AllowFiltering="False"
                DataField="ProjectStatusWorkflowRouteStepPK"
                HeaderText="&nbsp;" ReadOnly="True" ShowFilterIcon="False" Visible="False"
                UniqueName="ProjectStatusWorkflowRouteStepPKColumn">
                <HeaderStyle Width="40px" />
                <ItemStyle HorizontalAlign="Left" VerticalAlign="Top" Width="40px" />
            </telerik:GridNumericColumn>

        </Columns>
    </MasterTableView>
    <ClientSettings>
        <Resizing AllowColumnResize="True" />
    </ClientSettings>
    <FilterMenu EnableEmbeddedSkins="False" EnableImageSprites="False">
    </FilterMenu>
    <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Default"
        EnableEmbeddedSkins="False">
    </HeaderContextMenu>
</telerik:RadGrid>

    Private Sub SetFilterComboScript()
        For Each filterItem As GridFilteringItem In grvProjectSummary.MasterTableView.GetItems(GridItemType.FilteringItem)
            Dim rcmbStepFilter As RadComboBox = DirectCast(filterItem.FindControl("rcmbStepFilter"), RadComboBox)
            rcmbStepFilter.OnClientSelectedIndexChanged = "SelectedIndexChanged_" + Me.ClientID
        Next
    End Sub

    Private Sub grvProjectSummary_NeedDataSource(sender As Object, e As Telerik.Web.UI.GridNeedDataSourceEventArgs) Handles grvProjectSummary.NeedDataSource
        _ProjectWorkflowRouteType = ViewState("ProjectWorkflowRouteType")
        Dim myFilter As Integer = ViewState("myFilter")
        Dim GrantProgramFK As Integer = CInt(ddlGrantPrograms.SelectedValue)
        Dim UserFK As Integer = CInt(Session(eGrantsConst_Session.USER_LOGIN_ID))
        If HttpContext.Current.User.IsInRole(eGrantsConst_Role.BUREAU_REVIEW_MANAGER) Then
            If ddlReviewers.SelectedValue > 0 Then
                UserFK = ddlReviewers.SelectedValue
            End If
        End If
        grvProjectSummary.DataSource = BLL.BusObjects.ReviewBO.GetReviewWorkQueuProjectsByBureauFKGrantProgramYearFKRouteTypeFKUserFK(Session(eGrantsConst_Session.SELECTED_PROGRAM_YEAR), _
                                                                                                                                        CInt(Session(eGrantsConst_Session.SELECTED_BUREAU_ID)), _
                                                                                                                                        CInt(Session(eGrantsConst_Session.SELECTED_PROGRAM_YEAR_ID)), _
                                                                                                                                        _ProjectWorkflowRouteType, _
                                                                                                                                        UserFK, _
                                                                                                                                        GrantProgramFK, _
                                                                                                                                        myFilter)
        SetFilterComboScript()
    End Sub

[Don]

Solved:

    Private Sub grvProjectSummary_DataBound(sender As Object, e As EventArgs) Handles grvProjectSummary.DataBound
        SetFilterComboScript()
    End Sub