WatiN - interact with IE modal dialog browser window (c#)

I'm trying to use WatiN to automate downloading of files from a site.  The site lets me select all the files from grid and click a button to download.  Upon clicking download, the browser pops open a modal window that has me enter a name for the zip file prior to clicking save.
I'm having trouble getting WatiN to type the text into the text field.

Here is the code that opens the modal.
	// open zip file name dialog screen, to capture what user wants zip file name to be
   	var result;
	if (window.showModalDialog) { //IE
		result = window.showModalDialog("WBBSZipname.html", "DlgWin", "dialogWidth=1000px;dialogHeight=640px;help=no;status=no");
		if (result == null || result == "") 

		fm.target = "_self";    
	    fm.ZipFileName.value = result;
	    fm.MultInd.value = DownVal;    
	    fm.CheckedFileNames.value = fnames;    

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here is the code inside the modal window
<form onsubmit="JavaScript:GetZipFileName('OK');return false;">
<table width="100%" border="0" cellpadding="0"
	cellspacing="0" class="tableForms2">

        <td class="formTitle" height="35">Enter a Zip File Name for the multiple files selected</td>
        <td class="formTitle">&nbsp;</td>
        <td class="formTitle" height="35">Extension of .ZIP is assumed</td>
        <td class="formTitle">&nbsp;</td>
        <td class="formTitle" height="35">File names can contain numbers, letters(upper/lower), dash, underline and space.  (The latter 3 cannot be the first character)</td>
        <td class="formTitle"><br /></td>        
    <table width="100%" border="0" cellpadding="0"
	    cellspacing="0" class="tableForms">
    	<td height="35" width="12%" colspan="2" class="formTitle">
    	<input type="text" name="zipFileName" maxlength="35" style="width: 157px"/></td> 
		<td height="35" class="formTitle">&nbsp;</td>
        <td class="formTitle" align="center">
        <input class="buttonBlue" type="button" value="OK" onclick="JavaScript:GetZipFileName('OK');"></input>&nbsp;&nbsp;&nbsp;
        <input class="buttonBlue" type="button" value="CANCEL" onclick="JavaScript:GetZipFileName('CANCEL');"></input>        

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and here is some of the code i've tried to access the modal, non of which seems to work... note that Browser variable is an IE window via Browser = new IE(logInUrl) from elsewhere in the software.

var dialog = Browser.HtmlDialog(Find.ByUrl(url => url.Contains(@"WBBSZipname")));
                        var modalUrl = dialog.Url;

                        Browser.Eval("alert('" + modalUrl + "');");

                        var ie2 = new IE(modalUrl);
                        ie2.TextField(Find.ByName("zipFileName")).Value = transferSystemDownloadStruct.TransferSystemDownload.FileName;
                        var okButton = ie2.Button(Find.ByValue("OK"));


                            //Settings.AutoCloseDialogs = true;
                            //var popupWindow = WatiN.Core.Browser.AttachTo<IE>(Find.ByUrl(url => url.Contains(@"WBBSZipname")));
                            //popupWindow.DialogWatcher.CloseUnhandledDialogs = true;
                            //popupWindow.Eval("alert('I'm on the modal!!!');");

                            ////pop up window will ask for file name
                            //var textField = popupWindow.TextField(Find.ByName("zipFileName"));

                            //var okButton = popupWindow.Button(Find.ByValue("OK"));


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If it were a real popup rather than a Modal, i know how to handle it, but nothing seems to be working, so I must be doing something wrong.
Robert HamelSenior .NET developerAsked:
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Robert HamelSenior .NET developerAuthor Commented:
I think i've made progress...
  using (HtmlDialog htmlDialog = Browser.HtmlDialog(Find.ByUrl(url => url.Contains(@"WBBSZipname"))))

                            var textField = htmlDialog.TextField(Find.ByName("zipFileName"));

                             var okButton = htmlDialog.Button(Find.ByValue("OK"));



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Finally seeing action happening in the window.

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