public boolean performOk() {
   if (JBPMRuntimeManager.getDefaultJBPMRuntime() != null) {
     MessageDialog.openInformation(
         getShell(),
         "Warning",
         "You need to restart Eclipse to update the jBPM Runtime of existing projects.");
   }
   JBPMRuntimeManager.setJBPMRuntimes(jBPMRuntimesBlock.getJBPMRuntimes());
   return super.performOk();
 }