setProviderCount();
  public void finishConfiguration() {    ScalabilityXLevel prevLvl = (ScalabilityXLevel) getChild(0);    for (int i = 1, n = getChildCount(); i < n; i++) {      ScalabilityXLevel thisLvl = (ScalabilityXLevel) getChild(i);      thisLvl.setCustomers(prevLvl.getAgents());      prevLvl = thisLvl;    }  }