Loading controls dynamically in the pages of Radmultipage

HOW-TO
Load controls dynamically in the pages of Radmultipage

SOLUTION
You can attain the effect by subscribing to the TabClick server event of the control and using the LoadControl() method. Depending on the index of the clicked tab you may force the load of the respective page content. Review the code snippets below for further details:

//in the aspx of the page which holds the tabstrip and multipage
<radts:RadTabStrip id="RadTabStrip1" style="Z-INDEX: 101; LEFT: 264px; POSITION: 
 absolute; TOP:32px" runat="server" Theme="ClassicGreen" MultiPageID="RadMultiPage1"  
 AutoPostBack="True">
    <TabCollection>
     <radts:Tab Text="Tab1"></radts:Tab>
     <radts:Tab Text="Tab2"></radts:Tab>
    </TabCollection>
</radts:RadTabStrip>
<radmp:RadMultiPage id="RadMultiPage1" SelectedIndex = "0" style="Z-INDEX: 102; LEFT:
    264px; POSITION: absolute; TOP: 64px" Runat="server">
    <radmp:PageView ID="pageView1">
    </radmp:PageView>
    <radmp:PageView ID="pageView2">
    </radmp:PageView>
</radmp:RadMultiPage>

//and in the code-behind
protected Telerik.WebControls.RadTabStrip RadTabStrip1;
protected Telerik.WebControls.RadMultiPage RadMultiPage1;

private void Page_Load(object sender, System.EventArgs e)
{
   if(!Page.IsPostBack)
   {
    RadMultiPage1.PageViews[0].Controls.Clear();
    RadMultiPage1.PageViews[0].Controls.Add(LoadControl("~/FirstPage.ascx"));
   }    
}
private void RadTabStrip1_TabClick(object sender, Telerik.WebControls.RadTabStripClickEventArgs args)
{   
   switch(RadTabStrip1.TabCollection.IndexOf(args.ClickedTab.ID))
   {
    
    case 0:
       RadMultiPage1.PageViews[0].Controls.Clear();
       RadMultiPage1.PageViews[0].Controls.Add(LoadControl("~/FirstPage.ascx"));
       break;
    case 1:
       RadMultiPage1.PageViews[1].Controls.Clear();
       RadMultiPage1.PageViews[1].Controls.Add(LoadControl("~/SecondPage.ascx"));
       break;
   }
}