private void ListBox_MouseDoubleClick(object sender, MouseButtonEventArgs e)
 {
     var frame = new ImageFrame(ListBox.SelectedItem.ToString());
     frame.Show();
 }
 private void ListBox_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
 {
     if (_imageFrame == null)
     {
         _imageFrame = new ImageFrame(ListBox.SelectedItem.ToString());
         _imageFrame.Show();
     }
     else
     {
         _imageFrame.LoadImage(ListBox.SelectedItem.ToString());
         _imageFrame.Show();
     }
 }