silverlight invokescript security issue

Question

I am trying to run the demo application found at:

http://msdn.microsoft.com/en-us/library/cc491132%28v=VS.95%29.aspx

I have everything on my local computer. However when I try to the invoke script command I get the following error:

{System.Security.SecurityException: Attempted to perform an unauthorized operation.
   at System.Windows.Controls.WebBrowser.InvokeScript(String scriptName, String[] args)
   at ckapp.Views.ChildWindow1.button1_Click(Object sender, RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)}