public void ShiftRelative(Vector3 relativeShiftVector)
{
mSprites.ShiftRelative(relativeShiftVector);
// SpriteGrids don't attach
//for (int i = 0; i < mSpriteGrids.Count; i++)
//{
// SpriteGrid spriteGrid = mSpriteGrids[i];
// spriteGrid.Shift(shiftVector.X, shiftVector.Y, shiftVector.Z);
//}
mSpriteFrames.ShiftRelative(relativeShiftVector);
mTexts.ShiftRelative(relativeShiftVector);
}