Custom validator didn't fire when I am using RadMultiPage and tabstrip

[Dorababu]

I am having my design with radtabstrip and RadMultiPage as follows

<telerik:RadTabStrip ID="rdtabEmployee" runat="server" MultiPageID="rdmpPersonal"
            UnSelectChildren="True" Skin="WebBlue" EnableEmbeddedSkins="False" ClickSelectedTab="True"
            SelectedIndex="0" OnTabClick="tabClick">
            <Tabs>
                <telerik:RadTab runat="server" Text="Personal" PageViewID="rdpgPersonal">
                </telerik:RadTab>
                <telerik:RadTab runat="server" Text="Contact" PageViewID="rdpgContact">
                </telerik:RadTab>
</telerik:RadTabStrip>
<telerik:RadMultiPage ID="rdmpPersonal" runat="server">
            <telerik:RadPageView ID="rdpgPersonal" runat="server" Selected="true">
                <telerik:RadPanelBar runat="server" ID="rdpnlPersonal" ExpandMode="FullExpandedItem"
                    Skin="Vista" EnableEmbeddedSkins="false" Width="880px">
                    <Items>
                        <telerik:RadPanelItem Expanded="true" Text="Employee Personal Information" runat="server"
                            Selected="true">
                            <Items>
                                <telerik:RadPanelItem Value="AccountInformation" runat="server">
                                    <ItemTemplate>
                                        <label>
                                            Demop
                                        </label>
                                        <telerik:RadDatePicker ID="RadDatePicker1" Width="200px" runat="server" MinDate="1900-01-01"
                                            TabIndex="5">
                                            <Calendar ID="Calendar1" RangeMinDate="1900-01-01" runat="server">
                                            </Calendar>
                                        </telerik:RadDatePicker>
                                        <telerik:RadDatePicker ID="radDtHiredate" Width="200px" runat="server" MinDate="1900-01-01"
                                            TabIndex="5">
                                            <Calendar ID="calHire" RangeMinDate="1900-01-01" runat="server">
                                            </Calendar>
                                        </telerik:RadDatePicker>
                                        <asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="validatehiredate"
                                            SetFocusOnError="true" ControlToValidate="RadDatePicker1" ValidationGroup="accountValidation"
                                          ForeColor="Red"  Display="Dynamic">Can not Hire Guy less than 18 yrs</asp:CustomValidator>
                                        <br />
                                        <button onclick="javascript: NextDay(event); return false">
                                            Move to next day</button>
                                        <telerik:RadButton ID="rdbtnpersonalSaveNext" ValidationGroup="accountValidation"
                                            OnClick="rdbtnpersonalSaveNext_Click" TabIndex="11" runat="server" Text="Save & Next">
                                        </telerik:RadButton>
                                    </ItemTemplate>
                                </telerik:RadPanelItem>
                            </Items>
                        </telerik:RadPanelItem>
                    </Items>
                </telerik:RadPanelBar>
            </telerik:RadPageView>
            <telerik:RadPageView ID="rdpgContact" runat="server">
                <telerik:RadPanelBar runat="server" ID="RadPanelBar1" ExpandMode="FullExpandedItem"
                    Skin="Vista" EnableEmbeddedSkins="false" Width="880px">
                    <ItemTemplate>
                        <asp:TextBox ID="txtDemo" runat="server">
                        </asp:TextBox>
                    </ItemTemplate>
                </telerik:RadPanelBar>
                <label>
                    Demo Contact
                </label>
            </telerik:RadPageView>
</telerik:RadMultiPage>

When I click on second Tab and came back to first tab the custom validation which i had written fails, can some one help me..

<telerik:RadCodeBlock runat="server" ID="radcb">
            <script type="text/javascript" language="javascript">
                function monthDiff(d1, d2) {
                    var months;
                    var date1 = new Date(d1);
                    var date2 = new Date(d2);
                    return (date1 - date2) / (1000 * 60 * 60 * 24);
                    return months;
                }

                //function getLeapYear

                function difference(d1, d2) {
                    var diff = 18 * 12;
                    var Age = monthDiff(d1, d2);

                    var compareVal = 365 * 18; //getCompareVal(hiredate,dob);

                    if (Age >= compareVal) {
                        return true;
                        //true
                    } else {
                        return false; //false
                    }
                }
                function validatehiredate(value, arg) {
                    var datePicker = $find('<%= rdpnlPersonal.FindItemByValue("AccountInformation").FindControl("radDtHiredate").ClientID %>');
                    var datePicker1 = $find('<%= rdpnlPersonal.FindItemByValue("AccountInformation").FindControl("RadDatePicker1").ClientID %>');

                    var date = datePicker.get_selectedDate();
                    var date1 = datePicker1.get_selectedDate();
                    arg.IsValid = (difference(date, date1));
                }
            </script>
        </telerik:RadCodeBlock>

[Dimitar Terziev]

Hi,

I've made a sample page using the provided implementation trying to reproduce the experienced problem, but to no avail. Here is a video of my tests. In order to troubleshoot this issue, open a support ticket and provide a runnable sample page so we could test and debug it locally.

Kind regards,
Dimitar Terziev
the Telerik team