title: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). Telerik Application
body: <p>I'm getting this error when I add RadScheduler to my project.
  I'm using visual studio 2010 and RadControls 2011 q2
  Thanks for the help</p>
  
  <p>The Controls collection cannot be modified because the control contains code blocks (i.e. &lt;% ... %>).</p>
  
  <pre><code>Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
  
  Exception Details: System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. &lt;% ... %&gt;).
  
  Source Error: 
  
  An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
  
  Stack Trace: 
  
  
  [HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. &lt;% ... %&gt;).]
     System.Web.UI.ControlCollection.Add(Control child) +8828175
     Telerik.Web.SkinRegistrar.RegisterCssReference(Page _page, Control _control, String _url) +486
  
      [HttpException (0x80004005): Please, see whether wrapping the code block, generating the exception, within RadCodeBlock resolves the error.]
         Telerik.Web.SkinRegistrar.RegisterCssReference(Page _page, Control _control, String _url) +557
         Telerik.Web.SkinRegistrar.RegisterCssReferences(ISkinnableControl _control) +1563
         Telerik.Web.UI.RadDataBoundControl.RegisterCssReferences() +74
         Telerik.Web.UI.RadDataBoundControl.ControlPreRender() +50
         Telerik.Web.UI.RadDataBoundControl.OnPreRender(EventArgs e) +47
         Telerik.Web.UI.RadScheduler.OnPreRender(EventArgs e) +131
         System.Web.UI.Control.PreRenderRecursiveInternal() +103
         System.Web.UI.Control.PreRenderRecursiveInternal() +175
         System.Web.UI.Control.PreRenderRecursiveInternal() +175
         System.Web.UI.Control.PreRenderRecursiveInternal() +175
         System.Web.UI.Control.PreRenderRecursiveInternal() +175
         System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496
  </code></pre>