@Override
 public boolean isComplete() {
   if (credentialsPart == null) {
     return false;
   }
   return credentialsPart.isComplete();
 }
 @Override
 public boolean isPageComplete() {
   return credentialsPart.isComplete();
 }
 public void createControl(Composite parent) {
   Composite composite = credentialsPart.createComposite(parent);
   setControl(composite);
 }
 @Override
 public void enter() {
   initServer();
   credentialsPart.setServer(cfServer);
 }
 @Override
 public Composite createComposite(Composite parent, IWizardHandle wizard) {
   initServer();
   credentialsPart = new CloudFoundryCredentialsPart(cfServer, wizard);
   return credentialsPart.createComposite(parent);
 }