var ctrlman = m_Map.GetCtrlMan();
var controlstate = ctrlman.GetControlState();
var dpsize = controlstate.GetSizeDP();

var SetCXSize = 110;
dpsize.SetCX(SetCXSize);
var width_px = dpsize.GetCX();

alert(width_px);

CXCtrlMan ctrlman = m_Map.GetCtrlMan();
CXControlState	ctrlstate = ctrlman.GetControlState();
CXSize dpsize = ctrlstate.GetSizeDP(); 

long SetCxSz = 110;
dpsize.SetCX(SetCxSz);
long width_px = dpsize.GetCX();

CString msg;
msg.Format(_T("width_px : [%lu]"), width_px);
AfxMessageBox(msg);