No PageView Content are rendered

[anonym]

Hello i have follow ASPX Code:

telerik:radtabstrip id="RadTabStrip1" runat="server" selectedindex="0" enableembeddedskins="False"
        skin="FashionestaProductlist" multipageid="RadMultiPage1">
             <Tabs>
               <telerik:RadTab runat="server" PageViewID="RadPageView1" Selected="True" />
               <telerik:RadTab runat="server" PageViewID="RadPageView2" />
               <telerik:RadTab runat="server" PageViewID="RadPageView3" />
             </Tabs>
            </telerik:radtabstrip>

<telerik:radmultipage id="RadMultiPage1" runat="server" selectedindex="0">
                        <telerik:RadPageView ID="tabRecently" runat="server">
                            <div class="Content">

....

In each RadPageView i have a  RadRotator with dynamic data. Each PageView gets disabled when there is no data to bind:
tabRecently.Visible = false;

My problem is now when in RadPageView2 no data are binded, then i have RadPageView1 and  RadPageView3  .
 In RadPageView1 there is all fine, the data are rendered in <div class="Content"> but in the RadPageView3 there is no content, but the tab is available!     
Has someone a solution why there is no content in the tab ?? there is no div <div class="Content">