void IsLocked()
{
   	Worksheet wks = Project.ActiveLayer();
   	Column col(wks, 1);
    if(!col)
        return;
    vector& vec = col.GetDataObject();
	double dCur = vec[0];
	double dNew = -999;
	try{
		vec[0] = dNew;
	}
	catch(int nErr)
	{
		out_str("Locked");
		return;
	}
	vec[0] = dCur;
	return;
}