RadAjaxPanel conditional postback is removing css of telerik controls after uploading file

[Rohit]

Hi Team,
I am new user of telerick controls my problem is when if upload file i call given function   on
RadAjaxPanel conditional postback is removing css of telerik controls after uploading file

<telerik:RadScriptBlock runat="server" ID="RadScriptBlock2">

      <script type="text/javascript" language="javascript">

 

          function conditionalPostback(sender, args) {

              if (args.EventTarget == "<%= btnUploadDocuments.UniqueID %>")

              { args.EnableAjax = false; }

          }

      </script>

  </telerik:RadS

<telerik:RadAjaxPanel ID="panelMain" runat="server" ClientEvents-OnRequestStart="conditionalPostback" >

div class="upload_box">
                               <div class="details">
                                   <telerik:RadUpload AllowedFileExtensions=".pdf" ID="RadUpload1" ControlObjectsVisibility="AddButton, DeleteSelectedButton, RemoveButtons"
                                       runat="server">
                                   </telerik:RadUpload>
                                   <div class="upload">
                                       <telerik:RadButton ID="btnUploadDocuments" runat="server" Text="Upload" OnClick="btnUploadDocuments_Click">
                                       </telerik:RadButton>
                                       <asp:CustomValidator ID="custValidateUpload" runat="server" Display="Dynamic" ClientValidationFunction="validateRadUpload1">   <span class="errormessage">Only .pdf files are allowed.</span>
                                       </asp:CustomValidator>
                                   </div>
                               </div>
</telerik:RadAjaxPanel>

Please help me i will really appreciate that. thank 

[Eyup]

Hello Rohit,

Thank you for contacting us.

I have tried the provided code and everything works fine on my end.
It is very difficult to determine the exact cause of the problem just from the provided information. Could you please elaborate some more on the issue?:

• do you face this problem on other browsers?

• are you using any custom skin or additional styling?

• anything else that can be related to the issue

I am looking forward to your reply.

Kind regards,
Eyup
the Telerik team