Using Validations on RadPageView

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ASP.NET

I am trying to use Validations on RadPageView as below and its not working (Paging not working):

<telerik:RadTabStrip ID="RadTabStrip1" runat="server" MultiPageID="RadMultiPage1">
        <Tabs>
            <telerik:RadTab Text="Client Information" Width="200px">
            </telerik:RadTab>
            <telerik:RadTab Text="Your Contact Numbers" Width="200px">
            </telerik:RadTab>
            <telerik:RadTab Text="Use Advansys Numbers" Width="200px">
            </telerik:RadTab>
        </Tabs>
    </telerik:RadTabStrip>

<telerik:RadPageView runat="server" ID="RadPageView2">
            <div class="ClientClass">
                <table>
                    <tr>
                        <td>
                            <telerik:RadButton ID="OldMessagesRadButton" runat="server" ButtonType="ToggleButton"
                                ToggleType="Radio" AutoPostBack="false" BorderWidth="0" BackColor="transparent"
                                GroupName="Radio" Text="Old Messages">
                            </telerik:RadButton>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div class="classImg">
                                <telerik:RadXmlHttpPanel runat="server" Height="240px" ID="InfoCustomerRadXmlHttpPanel"
                                    Value="3" CssClass="xmlPanelCustomerInfo" Visible="true">
                                    <div class="classDiv">
                                        <table>
                                            <tr style="height: 30px">
                                            </tr>
                                            <tr>
                                                <td>
                                                    <asp:Label ID="Label1" runat="server" Text="Messages :" Font-Bold="true" Font-Size="Medium"></asp:Label>
                                                </td>
                                                <td colspan="2">
                                                </td>
                                                <td>
                                                    <telerik:RadComboBox ID="MessagesRadComboBox" runat="server" DataSourceID="">
                                                        <%--load client's sms --%>
                                                    </telerik:RadComboBox>
                                                </td>
                                            </tr>
                                        </table>
                                    </div>
                                </telerik:RadXmlHttpPanel>
                            </div>
                        </td>
                    </tr>
                    <tr style="height: 20px;">
                    </tr>
                    <tr>
                        <td>
                            <telerik:RadButton ID="NewMessageRadButton" runat="server" ButtonType="ToggleButton"
                                ToggleType="Radio" AutoPostBack="false" BorderWidth="0" BackColor="transparent"
                                GroupName="Radio" Text="Write New Message">
                                <%--<ToggleStates>
                              <telerik:RadButtonToggleState PrimaryIconCssClass="rbToggleRadioChecked"></telerik:RadButtonToggleState>
                              <telerik:RadButtonToggleState PrimaryIconCssClass="rbToggleRadio"></telerik:RadButtonToggleState>
                         </ToggleStates>--%>
                            </telerik:RadButton>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <div class="classImg">
                                <telerik:RadXmlHttpPanel runat="server" Height="240px" ID="radxmlhttppanel1" Value="3"
                                    CssClass="xmlpanelcustomerinfo">
                                    <div class="classDiv">
                                        <table cellpadding="5px" cellspacing="5px" frame="border" rules="groups" style="position: absolute">
                                            <tr>
                                                <td style="width: 120px;">
                                                    Phone:
                                                </td>
                                                <td style="width: 150px;">
                                                    <asp:TextBox ID="PhoneTextBox" runat="server" Width="116px" MaxLength="12"></asp:TextBox>
                                                </td>
                                                <td style="width: 200px;">
                                                   <%-- <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="PhoneTextBox"
                                                        Display="Dynamic" ErrorMessage="RequiredFieldValidator" ForeColor="Red">Required</asp:RequiredFieldValidator>--%>
                                                    <asp:CustomValidator ID="CustomValidator2" runat="server" Display="Dynamic" ControlToValidate="PhoneTextBox"
                                                        ClientValidationFunction="Validate_Sender" ForeColor="Red">Invalid Phone</asp:CustomValidator>
                                                </td>
                                            </tr>
                                            <tr>
                                                <td style="width: 200px;">
                                                    Message Sender:
                                                </td>
                                                <td style="width: 150px;">
                                                    <asp:TextBox ID="sendertxt" runat="server" Width="116px" MaxLength="11"></asp:TextBox>
                                                </td>
                                             <%--   <td style="width: 200px;">
                                                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="sendertxt"
                                                        Display="Dynamic" ErrorMessage="RequiredFieldValidator" ForeColor="Red">Required</asp:RequiredFieldValidator>
                                                    </td>--%>
                                                    <td style="width:200px;">
                                                    <asp:CustomValidator ID="CustomValidator1" runat="server" Display="Dynamic" ControlToValidate="sendertxt"
                                                        ClientValidationFunction="Validate_Sender" ForeColor="Red">Invalid message sender</asp:CustomValidator>
                                                </td>
                                            </tr>
                                        <%--    OnServerValidate="Sender_Validate"--%>
                                            <tr>
                                                <td style="width: 200px;">
                                                    Msessage Text:
                                                </td>
                                                <td>
                                                    <asp:TextBox ID="msgtxt" runat="server" TextMode="MultiLine" Height="88px" Width="280px"
                                                        onkeyup="Update_Length_Label('bodyContent_msgtxt', 'bodyContent_length_lbl')"></asp:TextBox>
                                                </td>
                                               <%-- <td>
                                                    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="msgtxt"
                                                        ErrorMessage="RequiredFieldValidator" Text="Required" ForeColor="Red">Reuired</asp:RequiredFieldValidator>
                                                </td>--%>
                                            </tr>
                                            <tr>
                                                <td>
                                                    Message Length:
                                                </td>
                                                <td colspan="2">
                                                    <asp:Label ID="length_lbl" runat="server" Width="280px" ViewStateMode="Enabled"></asp:Label>
                                                </td>
                                            </tr>
                                            <tr style="height: 10px;">
                                            </tr>
                                            <tr>
                                                <td colspan="2">
                                                    <asp:Button ID="Savebtn" runat="server" Text="Send" Font-Bold="False" Font-Size="Large"
                                                        ForeColor="#333333" Height="27px" Width="85px" OnClick="Sendbtn_Click" />
                                                </td>
                                            </tr>
                                        </table>
                                    </div>
                                </telerik:RadXmlHttpPanel>
                            </div>
                        </td>
                    </tr>
                </table>
            </div>
        </telerik:RadPageView>

when remove Validations Paging working fine , any suggestions !!