@ Register TagPrefix="dnn" TagName="RADMENU" Src="~/DesktopModules/r.a.d.menu/RadMenu.ascx" %>

Part 2, Add RADMENUAJAX to your skin

You cannot get the results you want without seeing the link to the skinning whitepaper below.  Basically, you will add this info to where you call in your RADMENU into your skin.  With the classic version, you used to add these into the skin.xml, but not with ASP.NET AJAX version of RADMENU.  Below is a link to the Telerik whitepaper with all the good little things you can do in DNN with radmenu.  Everything from animations, separators, etc, etc. 

Now this is important:   I read that DotNetNuke wont parse this info properly.  So, you'll have to add it directly to your .ascx manually as I did.   Parse your skin out, go up and grab the ascx and edit this in.  Basically, it's better to just skin that way anyway.  Take a look at how mine looks seen below.

Telerik Skinning API whitepaper:  http://www.telerik.com/help/aspnet/menu/menu_apireference.html
 
<dnn:RADMENUAJAX runat="server" EnableEmbeddedSkins="false" id="dnnRADMENU" Skin="Vista" ExpandAnimationType="InOutElastic" ExpandAnimationDuration="300" CollapseAnimationType="none" childGroupSeparator="*SkinPath*/Menu/dnn/img/child_sep.gif" childGroupSeparatorCssClass="childseparator" HeaderSeparator ="*SkinPath*/Menu/dnn/img/nav-sep.gif" HeaderSeparatorCssClass="headerseparator" />

Save the document and upload it back, refresh your site.  Should be working.

Part 3)  Let RADMENU AJAX FOR DNN see your style

In order for your solution to work, Telerik says you'd need to link to a properly named css file with the skin name.  Except, that isn't a good solution in DNN.  See, you cannot just go linking to external resources in your ascx skin because it will render outside of the header and your skin won't validate according to w3c standards. 

Instead, just include (combine) the CSS entries from your menu style document into your skin.css and comment the section so you can find it easily later. 

VERY IMPORTANT, the classes are SUFFIXED with the skin name. Suffix means FOLLOWING.  You can use the internal styles that are hidden away in the telerik UI DLL or make your own.  It can be named whatever you like, but you must suffix your classes with that name and that name must match what is set when you reference RADMENU (see step 2 below)

ex:  .RadMenu_Vista . 

.Radmenu goes before the underscore.  Now, RADMENU is using psudo classes, which are a little different than what you might be used to.  Have a look at my CSS below and you will see what I mean.

Here is a link describing all the styles that will absolutely work for you in DNN as they did for me:
http://www.telerik.com/help/aspnet-ajax/menu_appearancecssselectors.html

Here is the complete CSS code behind my menu, and yes, it sits in my skin.css. 

/* <RadMenu / Vista> */.RadMenu_Vista .headerseparator {background-image:url(Menu/dnn/img/nav-sep.gif);width:1px;height:50px;}
.RadMenu_Vista .rmLink {font-family:Tahoma;font-size:14px;font-weight:lighter;}

/* <Root items> */

telerik:RadScriptManager ID="RadScriptManager1" runat="server"/>

<div id="RadTabDiv">
<telerik:RadTabStrip Style="position: absolute; top: 84px;" ID="RadTabStrip1" SelectedIndex="0" runat="server" MultiPageID="RadMultiPage1" Height="100%" Width="100%">

<Tabs>

</Tabs>

</telerik:RadTabStrip>

<telerik:RadMultiPage Style="position: absolute; top: 134px;" ID="RadMultiPage1" runat="server" SelectedIndex="0">

<telerik:RadTextBox Runat="server">

</telerik:RadTextBox>

</telerik:RadMultiPage>

</div>

<div id="Next" style="padding: 20px; float:right">

<asp:Button ID="btnNext" runat="server" Text="Next" CssClass="Button" />

</div>

One of the user controls I am adding:

@ Control Language="vb" AutoEventWireup="false" CodeBehind="QuestionTextbox.ascx.vb" Inherits="CSS.QuestionTextbox" %>

<%

@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<div style="height:50px">

<asp:Label ID="lblQuestion" runat="server" Text="Question:"/>

<asp:Label ID="lblQuestionText" runat="server" Text="??????"/>

<br />

<telerik:RadTextBox ID="txtAnswer2" runat="server" Width="200"/>

<telerik:RadComboBox Runat="server"></telerik:RadComboBox>

</

div>
My Code behind (if it helps). In this example I am hardcoding the Tabs and usercontrols but in the final app these will be dynamically generated via a list held in external data.

Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

    If Not Page.IsPostBack Then

"General")

        AddTab(

"Check Nearby SCNs")

    End If

         AddControls()

End Sub

Private Sub AddTab(ByVal tabName As String)

    Dim tab As New RadTab()

    tab.Text = tabName

    RadTabStrip1.Tabs.Add(tab)

    Dim pageView As New RadPageView()

    pageView.ID = tabName

    RadMultiPage1.PageViews.Add(pageView)

End Sub

Private Sub AddControls()

    Dim ProcessID As Integer = 20

    Dim TaskID As Integer = 10

    Dim Pageview As RadPageView = FindControl("ctl00$ContentPlaceHolder1$General")

    Dim ucQuestion As UserControl = Page.LoadControl("UserControls/QuestionTextbox.ascx")

    ucQuestion.ID =

"uc" & ProcessID & TaskID

    Dim lblQuestionText As Label = ucQuestion.FindControl("lblQuestionText")

    lblQuestionText.Text =

"What is your name?"

    Dim ucQuestion2 As UserControl = Page.LoadControl("UserControls/Statement.ascx")

    ucQuestion2.ID =

"uc" & ProcessID & TaskID

    Pageview.Controls.Add(ucQuestion2)

    TaskID = 30

    Dim ucQuestion3 As UserControl = Page.LoadControl("UserControls/QuestionDropdown.ascx")

    ucQuestion3.ID =

"uc" & ProcessID & TaskID

    Pageview.Controls.Add(ucQuestion3)

    TaskID = 50

    Dim txt1 As New TextBox

    txt1.Text =

"THIS IS THE TEXT"

    Dim Pageview2 As RadPageView = FindControl("ctl00$ContentPlaceHolder1$Check Nearby SCNs")

    TaskID = 40

    Dim ucQuestion4 As UserControl = Page.LoadControl("UserControls/QuestionTextbox.ascx")

    ucQuestion4.ID =

"uc" & ProcessID & TaskID

    lblQuestionText = ucQuestion4.FindControl(

"lblQuestionText")

    lblQuestionText.Text =

"What is your name?"

    Pageview2.Controls.Add(ucQuestion4) 

    Dim btnNext As Button = FindControl("ctl00$ContentPlaceHolder1$btnNext")  

    btnNext.Enabled = 

True

End Sub

Protected Sub btnNext_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnNext.Click

    Dim Pageview As RadPageView = FindControl("ctl00$ContentPlaceHolder1$General")

    Dim ucQuestion As New UserControl

    ucQuestion = Page.LoadControl(

"UserControls/QuestionTextbox.ascx")

    ucQuestion.ID =

"uc" & Now

    Dim lblQuestionText As Label = ucQuestion.FindControl("lblQuestionText")

    lblQuestionText.Text =

"Time is: " & Now

    Pageview.Controls.Add(ucQuestion)

End Sub

Here's a sample of my grid: