public static CommandDelegate AlphaFrom(GUITexture texture, float startAlpha, double duration, CommandEase ease = null)
        {
            CheckArgumentNonNull(texture, "texture");

            return(ChangeFrom(texture.ToAlphaRef(), startAlpha, duration, ease));
        }
        public static CommandDelegate AlphaBy(GUITexture texture, float offset, double duration, CommandEase ease = null)
        {
            CheckArgumentNonNull(texture, "texture");

            return(ChangeBy(texture.ToAlphaRef(), offset, duration, ease));
        }