RadGrid's filter button property 'CurrentFilterFunction'  showing previous selected value

I am have gone through the below steps and facing some issues :

(1) Page load first time -> CurrentFilterFunction shows 'NoFilter' -> works fine
(2) Enter text in TextBox -> Press tab -> CurrentFilterFunction shows 'Contains'-> works fine
(3) Enter text in TextBox-> press filter button -> select 'DoesNotContains' from drop down list -> CurrentFilterFunction shows 'Contains'(wrong value, it should shows
                                                                                                                                                                                                                                                  'DoesNotContains' )
(4) Enter text in TextBox -> press filter button -> select 'StartsWith' from drop down list -> CurrentFilterFunction shows 'DoesNotContains'(wrong value, , it should
                                                                                                                                                                                                                                             shows 'StartsWith')

can anyone please tell me the reason of this behavior and what is the solution of it. 

below is the code snippet :

<telerik:RadGrid ID="gvParameterLookup" runat="server" AllowSorting="true" CellSpacing="0"
                    CellPadding="2" GridLines="none" HeaderStyle-CssClass="dnnGridHeader" AllowFilteringByColumn="true"
                    AutoGenerateColumns="false" AllowAutomaticUpdates="false" AllowPaging="false"
                    EnableEmbeddedBaseStylesheet="false" EnableEmbeddedSkins="false" >
                    <groupingsettings casesensitive="false" />
                    <mastertableview allowfilteringbycolumn="true" allowpaging="false">                          
                    <Columns>                    
                        
                        <telerik:GridTemplateColumn DataField="Subsystem" SortExpression="Subsystem" CurrentFilterFunction="Contains" 
  UniqueName="Subsystem"  AutoPostBackOnFilter="True" HeaderText="Subsystem">
                            <HeaderStyle Font-Bold="true" />
                            <HeaderTemplate>Subsystem</HeaderTemplate>
                            <ItemTemplate><%# Eval("Subsystem")%></ItemTemplate>
                        </telerik:GridTemplateColumn>

                            </Columns>
                    </mastertableview>
                    <clientsettings enablepostbackonrowclick="false" />
                </telerik:RadGrid>

I have a textbox in a template column. I can't get the value using the same technique as for a bound column. What is the syntax for retrieving this value both in client-side JavaScript and server-side C#?

I would like to sum the values for all the textboxes in the column in codebehind TextChanged and also sum them clientside with Javascript.


....
 <telerik:GridTemplateColumn HeaderText="Amount Approved" UniqueName="AmtApproved" HeaderStyle-Width="55px"
                            ItemStyle-Width="55px" HeaderStyle-HorizontalAlign="Right" ItemStyle-HorizontalAlign="Right">
                            <ItemTemplate>
                                <asp:TextBox ID="AmountApproved" runat="server" Width="55px" OnTextChanged="AmountApproved_TextChanged"
                                    AutoPostBack="true" CssClass="numericAlign"></asp:TextBox>
                            </ItemTemplate>
                        </telerik:GridTemplateColumn>
                        <telerik:GridClientSelectColumn UniqueName="ClientSelectColumn" HeaderStyle-HorizontalAlign="Right" ItemStyle-HorizontalAlign="Right">
                        </telerik:GridClientSelectColumn>
                    </Columns>
                </MasterTableView>
                <ClientSettings AllowKeyboardNavigation="true" EnableRowHoverStyle="true" EnablePostBackOnRowClick="true">
                    <ClientEvents OnRowSelected="handleTextBoxValue" OnRowDeselected="handleTextBoxValue" OnActiveRowChanged="sumAmtApproved" />
                    <Selecting AllowRowSelect="true" />
                </ClientSettings>
            </telerik:RadGrid>

I've been trying to make the RadEditor DocumentManger control work with a UNC path. Admin on the forum gave me this link but it's only for the <Telerik:RadFileExplorer> control.

How do I override the file provider for <telerik:RadEditor><telerik:EditorTool name="DocumentManager">

Can anyone explain why I get the following error?

System.Web.HttpParseException (0x80004005): Type 'Telerik.Web.UI.Calendar.DatePickerClientEvents' does not have a public property named 'OnLoad'. ---> System.Web.HttpException (0x80004005): Type 'Telerik.Web.UI.Calendar.DatePickerClientEvents' does not have a public property named 'OnLoad'.

The Telerik documentation on this page http://www.telerik.com/help/aspnet-ajax/input-client-side-onload.html states the following:
  The OnLoad event is supported by all RadInput controls.

Here's my markup:
<telerik:RadDateTimePicker
      ID="m_dpTargetDate"
      runat="server">
         <ClientEvents OnLoad="m_dpEventBegin_Load" />
</telerik:RadDateTimePicker>

<script type="text/javascript">
var m_dpEventBegin = null;
function m_dpEventBegin_Load(sender, args) {
      m_dpEventBegin = sender;
}
</script>

I can get other client-side events to fire.

Any help would be greatly appreciated.

Dear Support,

I am getting above error when radmenu is getting its datasource dynamically. please check the below code.


Dataset Table Structure

Radmenu Binding.

Please help me urgent.

Thanks
Rizwan

Sometimes my Elmah logs shows(note there is no namespace of my application code),

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Aspx

Code behind