public static void SepiaBackgroundEffect(PowerPointSlide curSlide, Selection selection)
        {
            PowerPointBgEffectSlide effectSlide = EffectsLabUtil.GenerateEffectSlide(curSlide, selection, false);

            if (effectSlide == null)
            {
                return;
            }

            effectSlide.SepiaBackground();
            effectSlide.GetNativeSlide().Select();
        }
        public static void GreyScaleRemainderEffect(PowerPointSlide curSlide, Selection selection)
        {
            PowerPointBgEffectSlide effectSlide = EffectsLabUtil.GenerateEffectSlide(curSlide, selection, true);

            if (effectSlide == null)
            {
                return;
            }

            effectSlide.GreyScaleBackground();
            effectSlide.GetNativeSlide().Select();
        }