//-----------------------------------------------------------------------------
// Game::UnLoadContent()
// unload content (resources loaded above)
// unload all content that was loaded before the Engine Loop started
//-----------------------------------------------------------------------------
public override void UnLoadContent()
{
TextureManager.Destroy();
ImageManager.Destroy();
GameSpriteManager.Destroy();
BoxSpriteManager.Destroy();
SpriteBatchManager.Destroy();
ProxySpriteManager.Destroy();
TimerEventManager.Destroy();
DeathManager.Destroy();
}