public Sprite GetSprite(string code, bool? tryGedSD = null)
 {
  bool hasTag = code.EndsWith(HDTag);

  if(tryGedSD.HasValue == false)
  {
   tryGedSD = hasTag;
  }

  if(tryGedSD.Value && isSlowDeviceCahed && hasTag)
  {
   string sdName = code.Replace(HDTag,SDTag);
   if(spriteIndex_.ContainsKey(sdName))
    return spriteIndex_[sdName];
   else
    Log.Error("Sprite {0} is not supporting HD/SD! Yet _hd tag is provided",sdName);
  }
  if(spriteIndex_.ContainsKey(code))
   return spriteIndex_[code];

  throw new KeyNotFoundException(string.Format("Sprite named {0} not found, maybe you need to repack sprites", code));
 }