Robust UserControl Navigation in Silverlight

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Media.Imaging;

namespace RCNavController
{
    public partial class NavController : UserControl
    {
        public NavController()
        {
            InitializeComponent();
        }

        private UIElement waitingControl = null;
        public void NavigateToControl(UIElement newControl)
        {
            waitingControl = newControl;
            WriteableBitmap bitmap = new WriteableBitmap(ContentContainer, null); //take screenshot
         
            ImageOverlay.Source = bitmap;//set the source of the image control
            bitmap.Invalidate();//kill the bitmap
            ImageOverlay.Visibility = System.Windows.Visibility.Visible; 
            GrayOverlay.Visibility = System.Windows.Visibility.Visible;
            Loader.Visibility = System.Windows.Visibility.Visible;
            DisplayOverlays.Begin();
        }

        public void Hide()
        {
            HideOverlays.Begin();//start hiding all the overlays to display the new control
        }

        private void DisplayOverlays_Completed(object sender, EventArgs e)
        {
            ContentContainer.Child = waitingControl; // change the control to the new one
            waitingControl = null;
        }

        private void HideOverlays_Completed(object sender, EventArgs e)
        {
            ImageOverlay.Visibility = System.Windows.Visibility.Collapsed; 
            GrayOverlay.Visibility = System.Windows.Visibility.Collapsed;
            Loader.Visibility = System.Windows.Visibility.Collapsed;
        }
    }
}