How do I catch and handle a Security Exception thrown when using DECLARATIVE security on a method?

I have a method with Declarative security defined as such:

[PrincipalPermissionAttribute(SecurityAction.Demand, Name="test", Role="Administrator")]
private void MyButton_Click(object sender, System.Windows.RoutedEventArgs e)
{
   // do something
}

Select allOpen in new window

Whenever I click on the button which executes the MyButton_Click() method, a SecurityException is thrown (as expected) because the user does not have the proper permissions to access the method.  My problem is that I cannot seem to catch the SecurityException that is being thrown in order to handle it gracefully.

I've tried adding try/catch blocks within the method as well as in the constructor of the WPF Window, and in the application Main() method. It seems that no matter where I put the try/catch, I cannot catch the SecurityException. Any clues?