Why does my jquery-ui modal dialog disappear immediately after it opens?

[Tamekii]

I'm trying to use a simple jquery-ui modal dialog as a delete confirmation in an ASP.NET C# application. I've done this many times before, but for some reason in this application it is misbehaving. I see the dialog pop up then it immediately disappears before I can click on either "Yes" or "No". Here's the relevant code (Javascript):\[code\] <script type="text/javascript" src="http://stackoverflow.com/resources/jquery-1.8.2.min.js"></script> <script type="text/javascript" src="http://stackoverflow.com/resources/jquery-ui-1.9.1.custom.min.js"></script> <link rel="stylesheet" type="text/css" href="http://stackoverflow.com/resources/ui-lightness/jquery-ui-1.9.1.custom.css" /> <script type="text/javascript"> var remConfirmed = false; function ConfirmRemoveDialog(obj, title, dialogText) { if (!remConfirmed) { //add the dialog div to the page $('body').append(String.Format("<div id='confirmRemoveDialog' title='{0}'><p>{1}</p></div>", title, dialogText)); //create the dialog $('#confirmRemoveDialog').dialog({ modal: true, resizable: false, draggable: false, close: function(event, ui) { $('body').find('#confirmRemoveDialog').remove(); }, buttons: { 'Yes, remove it': function() { $(this).dialog('close'); remConfirmed = true; if (obj) obj.click(); }, 'No, keep it': function() { $(this).dialog('close'); } } }); } return remConfirmed; } //String.Format function (since Javascript doesn't have one built-in String.Format = function() { var s = arguments[0]; for (var i = 0; i < arguments.length - 1; i++) { var reg = new RegExp("\\{" + i + "\\}", "gm"); s = s.replace(reg, arguments[i + 1]); } return s; } </script>\[/code\]Here's where I'm using the confirmation function (in the OnClientClick of an \[code\]<asp:Button>\[/code\] control):\[code\] <asp:Button ID="btnRemoveProgram" runat="server" Text="Remove" CausesValidation="false" OnClientClick="ConfirmRemoveDialog(this, 'Please confirm removal', 'Are you sure you wish to remove the selected Program? This cannot be undone.');" />\[/code\]As I said, I've successfully used this same construct (nearly identical code) many times before; I don't know why it isn't working now. Any ideas will be greatly appreciated, I'm truly stumped on this one.