public virtual void AddChildProgressMonitor(ProgressMonitor childProgressMonitor, int rangeFrom, int rangeTo)
{
ProgressListener childProgressMonitorListener = new ProgressListenerImpl(this, rangeFrom, rangeTo);
childProgressMonitor.AddProgressListener(childProgressMonitorListener);
this._childProgressMonitorToProgressListenerMap.Put(childProgressMonitor, childProgressMonitorListener);
}