var util = m_Map.GetUtility();
var filename = util.SaveImageDialog("C:\\", "MapImage.png");    
Map.SageImage(filename);

#include "CXUtility.h"

CXUtility util = m_Map.GetUtility();
CString filename = util.SaveImageDialog(_T("C:\\"), _T("MapImage.png"));
m_Map.SaveImage(filename);