Nested gridview on popup panel (modalpopupextender)

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Gridview

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Hello,
I have a nested gridview on a popup panel. This is the code of the panel:

<asp:ModalPopupExtender ID="popupApplic" TargetControlID="lnkFake2" CancelControlID="btnApplCancel" 
        PopupControlID="pnlEditAppl" BackgroundCssClass="modalBackground" DropShadow="true"
        runat="server">

<asp:Panel ID="pnlEditAppl" runat="server" CssClass="modalPopupWide" align="center" style="overflow-x:scroll;">
    <table class="mTable">
            <tbody><tr>
                <td>
                    <asp:Label ID="lblAreaDescr" runat="server" Text="Area:">
                </td>
                <td>
                    <asp:TextBox ID="txtAreaDescr" runat="server" CssClass="form-control">
                </td>
            </tr>    
            <tr>
                <td>
                    <asp:Label ID="lblNo" runat="server" Text="No: ">
                </td>
                <td>
                    <asp:TextBox ID="txtNo" runat="server" CssClass="form-control">
                </td>
            </tr>
    </tbody></table>
       <br>  
       <asp:GridView ID="gv1" runat="server" AutoGenerateColumns="false" 
        Visible="true" AllowPaging="True" PageSize="5" ShowFooter="true"
        CssClass="mGrid" PagerStyle-CssClass="pgr" AlternatingRowStyle-CssClass="alt"
           OnPageIndexChanging="gv1_PageIndexChanging"
              OnRowCancelingEdit ="gv1_RowCancelingEdit" 
              OnRowDeleting ="gv1_RowDeleting" 
              OnRowEditing="gv1_RowEditing" 
              OnRowUpdating="gv1_RowUpdating" 
              OnRowCommand="gv1_RowCommand">
           <columns>
             <asp:TemplateField HeaderText="S/N">
                <itemtemplate>
                    <asp:Label ID="lblrownum" runat="server" Text='<%#Eval("rownum") %>'>
                
            
            <asp:TemplateField HeaderText="ID">
                <itemtemplate>
                    <asp:Label ID="lblTypeID" runat="server" Text='<%#Eval("TypeID") %>'>
                
            

            <asp:TemplateField HeaderText="Description">
                <itemtemplate>
                    <asp:Label ID="lblDescr" runat="server" Text='<%#Eval("TypeDescr") %>'>
                
                <edititemtemplate>
                    <asp:TextBox ID="txtDescr" runat="server" Text='<%#Eval("TypeDescr") %>'>
                
                <footertemplate>
                    <asp:TextBox ID="txtAddDescr" runat="server">
                
            
              <asp:TemplateField >
              <itemtemplate>
                 <asp:LinkButton ID="btnEdit" Text="Edit" runat="server" CommandName="Edit" />                   
              
              <edititemtemplate>
                  <asp:LinkButton ID="btnUpdate" Text="Update" runat="server" CommandName="Update" />
                  <asp:LinkButton ID="btnCancel" Text="Cancel" runat="server" CommandName="Cancel" />
              
                  <footertemplate>
                      <asp:Button ID="btnInsert" runat="server" Text="Insert" CommandName="Insert" /> 
                                               
            
            <asp:TemplateField>
                <itemtemplate>
                     <span>
                    <asp:LinkButton ID="btnDelete" Text="Delete" runat="server" CommandName="Delete">
                         </span>
                
                <edititemtemplate>
                     <span>
                    <asp:LinkButton ID="btnDelete" Text="Delete" runat="server" CommandName="Delete">
                     </span>
                
             

             
       <br>      
          <table>
        <tbody><tr>
            <td>
                <asp:Button ID="btnApplSave" runat="server" Text="Update" OnClick="btnApplSave_Click" ValidationGroup="valPnlAppl" CssClass="btn btn-default"/>
            </td>
            <td> </td>
            <td>
                <asp:Button ID="btnApplCancel" runat="server" Text="Cancel" CssClass="btn btn-default"/>
            </td>
        </tr>
    </tbody></table>
    
<asp:LinkButton ID="lnkFake2" runat="server">

The problem is when a have a postback action on the gridview (insert/update/delete) the popup panel closes.

How can I prevent that? I would appreciate any kind of help, thank you.

What I have tried:

I added the following:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <contenttemplate>
        .....gridview code....

           <triggers>
               <asp:AsyncPostBackTrigger ControlID="gv1"/>