private void mnuSetBackground_Click(object sender, RoutedEventArgs e)
        {
            string filename = FileDialog.GetOpenFilename("Open background image...", "png", "Image File");

            if (filename != null)
            {
                try
                {
                    BitmapImage img = new BitmapImage(new Uri(filename));

                    RealizedNetworkImage ri = new RealizedNetworkImage();
                    ri.Bitmap               = img;
                    ri.FullFilename         = filename;
                    ri.SourceImage          = new WirelessNetworkImage();
                    ri.SourceImage.Scale    = 1.0 / 39;
                    ri.SourceImage.Filename = filename;


                    NetworkControl.Images.Clear();
                    NetworkControl.Images.Add(ri);

                    Network.Images.Clear();
                    Network.Images.Add(ri.SourceImage);

                    NetworkControl.Redraw();
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Exception while trying to load image.\n" + ex.ToString());
                }
            }
        }
        private void mnuLoad_Click(object sender, RoutedEventArgs e)
        {
            string filename = FileDialog.GetOpenFilename("Load Project...", "ws", "Wireless Simulator File");

            if (filename != null)
            {
                // Try to load it
                try
                {
                    WirelessNetwork wn = LoadNetwork(filename);

                    StopSimulation();
                    SetupWirelessNetwork(wn);
                    SetAutoload(filename);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Exception while trying to Load file.\n" + ex.ToString());
                }
            }
        }