Hi, I am using ajax extenders to enhance the functionality of my web site. NOw problem is that i have made a control  which contains following code

1                <asp:TextBox ID="txtDatedDate" runat="server" MaxLength="10" Width="70px" ValidationGroup="TitleSave"></asp:TextBox>
2                <asp:ImageButton ID="ibtnDatedDate" runat="server" ImageUrl="../Resources/Images/CalendarControlDropDown.GIF"
3                    ImageAlign="Top" TabIndex="-1" />
4                <cc1:MaskedEditExtender ID="txtDatedDate_MaskedEditExtender" runat="server" TargetControlID="txtDatedDate"
5                    Mask="99/99/9999" MessageValidatorTip="true" MaskType="Date" DisplayMoney="None"
6                    AcceptNegative="None" ErrorTooltipEnabled="True">
7                </cc1:MaskedEditExtender>
8                <cc1:CalendarExtender ID="txtDatedDate_CalendarExtender" runat="server" Enabled="True"
9                    TargetControlID="txtDatedDate" Animated="False" PopupPosition="TopLeft" PopupButtonID="ibtnDatedDate"
10                   Format="MM/dd/yyyy">
11               </cc1:CalendarExtender>
12               <br />
13               <cc1:MaskedEditValidator ID="txtDatedDate_MaskedEditValidator" runat="server" ControlExtender="txtDatedDate_MaskedEditExtender"
14                   ControlToValidate="txtDatedDate" SetFocusOnError="true" Display="Dynamic" InvalidValueBlurredMessage="Invalid Date"
15                   IsValidEmpty="true" ValidationGroup="TitleSave">                     
16               </cc1:MaskedEditValidator>

  This all code is in a seperate ascx page. I am using this code in my main aspx page.  Now if i hide this control inside upadte pannel and set

txtDatedDate_MaskedEditValidator.enabled = false

when I try to submit record i get the following error :-

Microsoft JScript runtime error: 'ctl00_cntplhMain_rpMortgages_ctl01_ucMortgage_ucSuppleme...' is undefined

 this error comes on line 

 headElements[0].appendChild(scriptElement);  of Sys$_ScriptLoader$_loadScriptsInternal() function.

i view the scriptElement and i found following script in its outerHTML:

<SCRIPT type=text/javascript>

MaskedEditSetCssClass(ctl00_cntplhMain_rpMortgages_ctl01_ucMortgage_ucSupplementalRecording_ucRecordingInformation_txtRecordedDate_MaskedEditValidator,'MaskedEditError');

</SCRIPT> 

 How can I fix this issue plz help me its very urgent.

BTW thanks In advance 

I believe that you are confusing the Javascript.  Regardless, if the user control is not visible, then there is no reason to set the Enabled property because IsValidEmpty is already set to true.  In other words, since the TextBox in question will remain empty because it's hidden, no validation will occur anyway.  So, do not set the Enabled property and see what happens.