private void Btn_CreateWallpaper(object sender, RoutedEventArgs e)
{
CreateWallpaperView createWindow = new CreateWallpaperView();
createWindow.Show();
createWindow.Closed += CreateWindow_Closed;
}
private void CreateWindow_Closed(object sender, EventArgs e)
{
CreateWallpaperView createWindow = sender as CreateWallpaperView;
createWindow.Closed -= CreateWindow_Closed;
}