How to show a modal dialog page  ?

Hi
I want to show a modal dialog page in my application, I am using ASP.NET 2.0, AJAX and VB.Net.
I have a page that uses a master page, and I need to call a page as a modal page, but I don't  know what is missing because I try in several ways and I didn't get it works.
I am using AJAX Extensions and may be it can be causing problems to runing the scripts.

This is the html code for calling the modal:
<%@ Page Language="VB" MasterPageFile="~/MAIN.master" AutoEventWireup="false" CodeFile="pagRsgSemicuantitativo.aspx.vb" Inherits="pagRsgSemicuantitativo" title="Análisis de riesgo " %>

<%@ MasterType VirtualPath="~/Main.master" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<script type ="text/javascript">    
   function ventanahija(pagina,nombre,tamanos)
    {
        var val=window.showModalDialog(page, name, size);
           }
</script>
<cc1:ToolkitScriptManager runat="server" EnableScriptGlobalization="true" EnableScriptLocalization="true" ID="ScriptManager1" ></cc1:ToolkitScriptManager>
:
This is the vb code:
 Protected Sub CallPageMD()      

        Dim page As String = "pagParametrosAD.aspx"
        Dim name As String = cmbRegion.SelectedItem.Text.Trim()
        Dim size As String = "dialogWidth:826px;dialogHeight:565px"
        Dim script As String = "<script language='javascript'>ventanahija('" & page & "', '" & name & "', '" & size & "');</script>"
        'Page.ClientScript.RegisterStartupScript(Page.GetType, "pagParamMD", script)
        ScriptManager.RegisterStartupScript(Me, Me.GetType(), "pagParamMD", script, True)
End Sub

I already tryied with Page.ClientScript .RegisterStartupScript and ScriptManager.RegisterStartupScript, but I dont get to show the modal page.

Thanks in advance for your help.


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