I'm using a jquery UI dialog to modify a data row in a ASP.NET website, When opening the dialog I append the dialog to the underlaying form, this gives me the possibility of using postbacks. $('#' + id).parent().appendTo($("form"));
But when I set the dialog property modal: true Not just the background is grayed out, the dialog is also gray and inaccessible. 
If I remove the $('#' + id).parent().appendTo($("form")); it works like supposed to but then i can't use postbacks.
Am I doing something wrong or do i miss a point to get this to work?
Javascript in top of .aspx
<script type="text/javascript">
    $(document).ready(function () {
        $('#workDialog').dialog({
            autoOpen: false,
            draggable: true,
            resizable: false,
            width: 800,
            height: "auto",
            modal: true
        });
    });
    function showDialog(id) {
        $('#' + id).parent().appendTo($("form"));
        $('#' + id).dialog("open");
    }
    function closeModalDiv(id) {
        $('#' + id).dialog("close");
    }
</script>
The div containing the dialog
<div id="workDialog" title="Basic dialog">
    <asp:UpdatePanel ID="upWorkDialog" runat="server" UpdateMode="Conditional">  <ContentTemplate>
        <table id="Table1" class="item">
        <tr>
            ...
        </tr>
        <tr>
            <td><asp:TextBox ID="txt...></asp:TextBox></td>
            <td><asp:TextBox ID="txt...></asp:TextBox></td>
            <td><asp:TextBox ID="txt...></asp:TextBox></td>
            <td><asp:TextBox ID="txt...></asp:TextBox></td>
        </tr>
        </table>
        <asp:Label ID="lblWorkEditError" runat="server" Text=""></asp:Label>
        <asp:Button ID="btnSave" runat="server" Text="Gem" OnClick="btnSave_Click" />
        <asp:Button ID="btnCancel" runat="server" Text="Annuller" OnClientClick="javascript:closeModalDiv('workDialog');" />
    </ContentTemplate></asp:UpdatePanel>
</div>
 
     
     
     
     
     
     
     
     
    