Problem loading ascx dynamically after already using another ascx

Hi Guys
Im a newbie using vb.net, asp 3.5, sql 2005 vs2008
Ive got some custom code that im using to load user controls dynamically depending on the option a user selects from a menu control on the page.

I wanted to create an admin page that can be used to provide a one stop shop to complete all actions within an app im building, (like a template/iframe scenario that loads all selections in a screen on the right)
My code works, however when the user has completed an action sucesfully within one ascx, then selects another from the menu on the left, it wont load the new control, it comes up blank like it hasnt refreshed properly meaning that they have to close down the page and reopen it. (which is very annoying)
My codes below, can someone take a look and see if they can see whats wrong.

Thanks in advance.
 
Partial Public Class verified Inherits System.Web.UI.Page 'd ...