/// <summary>
 /// Positions a sprite relatively to the center of its parent.
 /// Values are pixels to move away from the parent.
 /// </summary>
 /// <param name="sprite"></param>
 /// <param name="pixelsFromTop">Pixels from top - positive values places the sprite closer to the bottom</param>
 /// <param name="pixelsFromLeft">Pixels from left - positive values places the sprite closer to the right</param>
 public static void pixelsFromCenter(this IPositionable sprite, int pixelsFromTop, int pixelsFromLeft)
 {
     sprite.pixelsFromCenter(pixelsFromTop, pixelsFromLeft, UIyAnchor.Center, UIxAnchor.Center);
 }
 /// <summary>
 /// Positions a sprite in the center of its parent.
 /// </summary>
 /// <param name="sprite"></param>
 public static void positionCenter(this IPositionable sprite)
 {
     sprite.pixelsFromCenter(0, 0);
 }