I am trying to create a way to dynamically choose the skin based on the value of a QueryString Value. Based on a post I found I created a file called LayoutSelector.ascx which contains:

<%@ Control Language="VB" AutoEventWireup="false" Explicit="true" Inherits="DotNetNuke.UI.Skins.Skin" %>

<script runat="server">
    Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
          Dim layout = "/RumpusMain/RumpusMain.ascx"
          Dim CategoryID =  0
          If Request.QueryString("CategoryID") <> "" Then
                CategoryID = Request.QueryString("CategoryID")
                Select Case CategoryID
                     Case 32
                           layout = "/Rumpus-MountUnion/RumpusMain.ascx"
                End Select
           End If
           Controls.Add(LoadControl(TemplateSourceDirectory + layout))
      End Sub
</script>

This code works in that it loads the appropriate skin file. However I get the following error:

DotNetNuke.Services.Exceptions.PageLoadException: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

After hours of unsuccessful google searches I found that if I removed Inherits="DotNetNuke.UI.Skins.Skin" from my skin file the error went away. Unfortunately non of the DotNetNuke Components will work. Does anyone have any suggestions on how to work around this.