Asp Update Panel Not Working in Proper with Ajax Modal Popup Extender in visual Studio 2013 But Its Working in Visul Studio 2012

<asp:UpdatePanel ID="up1" runat="server"><ContentTemplate><table style="width:60%;border:2px  solid"><tr><td colspan="3">
        State:</td></tr><tr><td>
            Countery</td><td><asp:DropDownList ID="ddlCountry" runat="server" /></td></tr><tr><td style="width:20%"> State Name </td><td style="width:25%"><asp:TextBox ID="txtSerch" runat="server" Width="200"></asp:TextBox></td><td style="width:15%"><asp:Button ID="btnSerch" runat="server" Text="Serch" Width="80" OnClick="btnSerch_Click" /></td></tr><tr><td style="text-align:right" colspan="3"><asp:Button ID="btnNew" runat="server" Text="Add New" OnClick="btnNew_Click" /><asp:Label ID="lbl" runat="server" Text="" Style="display:none"></asp:Label></td> </tr><tr><td colspan="3" style="text-align:center"></td></tr><tr><td style="width:100%" colspan="3"><asp:GridView ID="grv1" runat="server" AutoGenerateColumns="false" AllowPaging="true" AllowSorting="true" Caption="State List" Width="100%" OnPageIndexChanging="grv1_PageIndexChanging" OnSorting="grv1_Sorting" PageSize="7"><Columns><asp:TemplateField><ItemTemplate><asp:ImageButton ID="lnkEdit" runat="server" ImageUrl="~/Images/Edit.png" OnClick="lnkEdit_Click"></asp:ImageButton>&nbsp;<asp:ImageButton ID="lnkDelete" runat="server" ImageUrl="~/Images/Delete.png" OnClick="lnkDelete_Click"></asp:ImageButton></ItemTemplate></asp:TemplateField><asp:BoundField HeaderText="StateId" DataField="StateId" SortExpression="StateId" ReadOnly="true" /><asp:BoundField HeaderText="StateName" DataField="StateName" SortExpression="StateName" /><asp:BoundField HeaderText="CountryName" DataField="CountryName" SortExpression="CountryName" /><asp:CheckBoxField HeaderText="IsActive" DataField="IsActive" SortExpression="IsActive" /></Columns></asp:GridView></td></tr></table><asp:Panel ID="PanelAddState" runat="server" Width="80%" BorderColor="Green" BorderStyle="Outset" BorderWidth="5" BackColor="SlateBlue"><asp:Panel ID="PanelAddStateTitle" runat="server" Width="100%" HorizontalAlign="Center" style="cursor:move;display:none"><b> Add State Details</b></asp:Panel><table style="width:100%;margin:5px;border:2px solid blue"><tr><td>
                    Country Name</td><td>:</td><td><asp:DropDownList ID="ddlAddCountry" runat="server"></asp:DropDownList></td></tr><tr><td align="left" width="25%">
                State Name</td><td width="2%">
                    :</td><td><asp:TextBox ID="txtAddStateName" runat="server" placeHolder="Enter Country Name"></asp:TextBox><asp:RequiredFieldValidator ID="rfv1" runat="server" ControlToValidate="txtAddStateName" ErrorMessage="Require State Name"  ValidationGroup="Add" ></asp:RequiredFieldValidator><ajaxToolkit:ValidatorCalloutExtender ID="vce1" runat="server" TargetControlID="rfv1" Width="300"></ajaxToolkit:ValidatorCalloutExtender> </td></tr><tr><td align="left">
                    Is Active</td><td>:</td><td><asp:CheckBox ID="chkAddIsActive" runat="server" /></td></tr><tr><td></td><td></td><td><asp:Button ID="btnSave" runat="server"  ValidationGroup="Add" Text="Save" OnClick="btnSave_Click" /> &nbsp;<asp:Button ID="btnCancel" runat="server" Text="Cancel" CausesValidation="false" /></td></tr></table></asp:Panel><ajaxToolkit:ModalPopupExtender ID="mpe1" runat="server" TargetControlID="btnNew" PopupControlID="PanelAddState" PopupDragHandleControlID="PanelAddStateTitle" DropShadow="true" RepositionMode="RepositionOnWindowResizeAndScroll" CancelControlID="btnCancel" BackgroundCssClass="modelPoupBackground" OnLoad="mpe1_Load"  ></ajaxToolkit:ModalPopupExtender><asp:Button ID="btndummy" runat="server" Text="btndummy" style="display:none" /><asp:Panel ID="PanelEditState" runat="server" Width="80%" BorderColor="Green" BorderStyle="Outset" BorderWidth="5" BackColor="SlateBlue"><asp:Panel ID="PanelEditStateTitle" runat="server" Width="100%" HorizontalAlign="Center" style="cursor:move;display:none"><b> Update State Details</b></asp:Panel><table style="width:100%;margin:5px;border:2px solid blue"><tr><td>
                    Country Name</td><td>:</td><td><asp:TextBox ID="txtCountry" runat="server" ReadOnly="true"></asp:TextBox></td></tr><tr><td align="left" width="25%">
                State Name</td><td width="2%">
                    :</td><td><asp:TextBox ID="txtState" runat="server" placeHolder="Enter State Name"></asp:TextBox><asp:RequiredFieldValidator ID="rfv2" runat="server" ControlToValidate="txtState" ErrorMessage="Require State Name"  ValidationGroup="Edit" Display="None" ></asp:RequiredFieldValidator><ajaxToolkit:ValidatorCalloutExtender ID="ValidatorCalloutExtender1" runat="server" TargetControlID="rfv2" Width="300"></ajaxToolkit:ValidatorCalloutExtender> </td></tr><tr><td align="left">
                    Is Active</td><td>:</td><td><asp:CheckBox ID="chk1Edit" runat="server" /></td></tr><tr><td></td><td></td><td><asp:Button ID="btnUpdate" runat="server"  ValidationGroup="Edit" Text="Save" OnClick="btnUpdate_Click" /> &nbsp;<asp:Button ID="btnEditCancle" runat="server" Text="Cancel" CausesValidation="false" /></td></tr></table></asp:Panel><ajaxToolkit:ModalPopupExtender ID="mpe2" runat="server" TargetControlID="btndummy" PopupControlID="PanelEditState" PopupDragHandleControlID="PanelEditStateTitle" DropShadow="true" RepositionMode="RepositionOnWindowResizeAndScroll" CancelControlID="btnCancel" BackgroundCssClass="modelPoupBackground"></ajaxToolkit:ModalPopupExtender><asp:Button ID="btnDummyDelete" runat="server" Text="btndummy" style="display:none" /><asp:Panel ID="PanelDeleteState" runat="server" Width="60%" BorderColor="Green" BorderStyle="Outset" BorderWidth="5" BackColor="GreenYellow" style="border-radius:10px 10px"><asp:Panel ID="PanelDeleteStateTitle" runat="server" Width="100%" HorizontalAlign="Center" style="cursor:move;display:none"><b> Panel Delete Country</b></asp:Panel><table style="width:100%;margin:5px;border:2px solid blue"><tr><td align="left" width="25%"><b style="color:red;font-family:Tahoma;font-size:15px;text-align:center">
                    Are You Sure You Want To Delete State Details</b></td><tr><td style="text-align:center"><asp:Button ID="btnYes" runat="server"  Text="Delete" OnClick="btnYes_Click"  Width="65"/> &nbsp;<asp:Button ID="btnNo" Width="65" runat="server" Text="No"/></td></tr></table></asp:Panel><ajaxToolkit:ModalPopupExtender ID="mpe3" runat="server" TargetControlID="btnDummyDelete" PopupControlID="PanelDeleteState" PopupDragHandleControlID="PanelDeleteStateTitle" DropShadow="true" RepositionMode="RepositionOnWindowResizeAndScroll" CancelControlID="btnNo" BackgroundCssClass="modelPoupBackground"></ajaxToolkit:ModalPopupExtender></ContentTemplate></asp:UpdatePanel>