function GetMapRect()
{
  var mRect = m_Map.GetUtility().GetMapRect();
  alert("LLon : "  + mRect.GetLLong());
  alert("LLat : "  + mRect.GetLLat());
  alert("RLong : " + mRect.GetRLong());
  alert("ULat : "  + mRect.GetULat());
}

준비중입니다...