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

var width_py = dpsize.GetCY()/2 -300;
alert(width_py);

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

long height_px = dpsize.GetCY()/2 - 100;
		
CString msg;
msg.Format(_T("width_px : [%lu]"), width_px);
AfxMessageBox(msg);