//Modify Media Button-------
 private void ModifyMedia(object sender, RoutedEventArgs e)
 {
     if ((Media)BookRecord.SelectedItem != null)
     {
         object      currentContent = this.Content;
         Media       librarydata    = (Media)BookRecord.SelectedItem;
         ModifyMedia newPage        = new ModifyMedia(currentContent, librarydata);
         this.Content = newPage;
     }
     else
     {
         showErrorDialoge("Please select the media");
     }
 }
        private void modifyMedia_Click(object sender, RoutedEventArgs e)
        {
            object currentContent = this.Content;

            media = (Media)libraryList.SelectedItem;
            if (media != null)
            {
                ModifyMedia modifiedMedia = new ModifyMedia(currentContent, media);
                this.Content             = modifiedMedia;
                media                    = null;
                libraryList.SelectedItem = null;
            }
            else
            {
                MessageBox.Show("Please select media to modify!");
            }
        }