This markup:
<Telerik:RadTabStrip ID="detailsStrip" runat="server" MultiPageID="RadMultiPage1"
                            ClickSelectedTab="true" OnTabClick="detailsStrinp_TabClick" SelectedIndex="0"
                            Align="Justify" Orientation="VerticalLeft" EnableEmbeddedSkins="false" AutoPostBack="true"
                            Skin="WFS" ScrollChildren="true" OnClientTabSelected="onTabSelected">
                            <Tabs>
                                <Telerik:RadTab Text="General"  PageViewID="GeneralView">
                                </Telerik:RadTab>
                                <Telerik:RadTab Text="History" PageViewID="HistoryView">
                                </Telerik:RadTab>
                                <Telerik:RadTab Text="Dokumenty" PageViewID="DocsView">
                                </Telerik:RadTab>
                                <Telerik:RadTab Text="AddInfo" PageViewID="AddInfoView">
                                </Telerik:RadTab>
                                <Telerik:RadTab Text="Gallery" PageViewID="GalleryView">
                                </Telerik:RadTab>
                                <Telerik:RadTab Text="Process" PageViewID="ProcessView" Visible="false" />
                            </Tabs>
                            <TabTemplate>
                                 <div class="nav-item">
                                    <div class="nav-item-img"></div>
                                    <div class="nav-item-header"><%# DataBinder.Eval(Container,"Text") %></div>
                                </div>
                            </TabTemplate>
                        </Telerik:RadTabStrip>

Generates js issue:
if(D.TabStripOrientation.isVertical(H)){G="offsetHeight";
F=function(J,K){J.firstChild.firstChild.firstChild.style.height=K+"px";
(null reference)
Version: 2012.3.1016.35

i have create tab by using tabstrip and assing pageview to that tab but on delete of tab the page view is not deleting .for deleteing  i have use close imagebutton,tab will delete but pageview is not delete.pls suggest me how to delete tab alone tab alone with pageview.

I work in an environment of Visual Studio 2013 
C # aspx 
ie10 
See the attached project.
After pressing the Send key twice, I get the message below.
The control ID is generated automatically by Rad.

Thanks in advance 

KAMARA YAIR

Email

KAMARA.Y@LAVIETIMETECH.COM

Exception details:

Unhandled exception at line 15, column 9936 in http://localhost:53353/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=;;System.Web.Extensions,+Version=3.5.0.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35:he-IL:eb198dbd-2212-44f6-bb15-882bde414f00:ea597d4b:b25378d2;Telerik.Web.UI,+Version=2014.1.403.35,+Culture=neutral,+PublicKeyToken=121fae78165ba3d4:he-IL:64f74e2d-5497-4ab7-8321-89bccc22f4bb:16e4e7cd:86526ba7:874f8ea2:f7645509:24ee1bba:e330518b:1e771326:88144a7a:8e6f0d33:6a6d718d:ed16cbdc

0x800a139e - JavaScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Multiple controls with the same ID 'ctl02' were found. FindControl requires that controls have unique IDs.