HostComponent[] hosts = experiment.getHosts();
HostComponent[] hosts = experiment.getHostComponents();
  private void initRunButton() {    HostComponent[] hosts = experiment.getHosts();    for (int i = 0; i < hosts.length; i++) {      NodeComponent[] nodes = hosts[i].getNodes();      if (nodes != null && nodes.length > 0) {	for (int j = 0; j < nodes.length; j++) {	  AgentComponent[] agents = nodes[j].getAgents();	  if (agents != null && agents.length > 0) {	    runButton.setEnabled(true);	    return;	  }	}      }    }    runButton.setEnabled(false);  }