Navigation problem in crystal report with asp.net

I am using crystal report with asp.net 2005, I have created a page with crystal report and showing that into another page with in a iframe.
I am loading this page on click of menu control.
The proble is navigation of pages. I can not navigate to 3rd page by clicking on next navigation button.

code sample is below

in aspx file

<asp:UpdatePanel ID="updatePanel2" runat="server">
                     <ContentTemplate>
                        <ajaxToolkit:TabContainer runat="server" ID="Tabs" Height="445px"  ActiveTabIndex="0" Width="830px" Font-Names="Arial">
<ajaxToolkit:TabPanel runat="server" ID="Panel2" HeaderText="Astro Profile" >
                            <ContentTemplate>
                               
                                        <iframe id="Iframe1" runat="server"  style="width: 805px; height: 444px;" frameborder="0" />

                            </ContentTemplate>                            
                        </ajaxToolkit:TabPanel>
                   
                        <ajaxToolkit:TabPanel runat="server" ID="Panel3">
                            <ContentTemplate>
                                <iframe id="Iframe2" runat="server"  style="width: 805px; height: 444px;" frameborder="0"  />
                            </ContentTemplate>
                        </ajaxToolkit:TabPanel>
           
                    </ajaxToolkit:TabContainer>
                     </ContentTemplate>                                    
                  </asp:UpdatePanel>  



in cs file

on Selected_Node_Change event of tree control

this.iframe2.addattribute("SRC","PageWithCrystalReport.aspx");


please advise and many thanks in anticipation