public void tableRowSelected(ValueChangeEvent event) {
   InstanceDto instance = (InstanceDto) serverTable.getValue();
   if (instance != null) {
     serverButtonsBottom.refresh(instance);
     serverDesc.show(instance);
   } else {
     serverButtonsBottom.initialize();
     serverDesc.initialize();
   }
 }
 public void refreshDesc() {
   InstanceDto instance = (InstanceDto) serverTable.getValue();
   serverButtonsTop.initialize();
   if (instance != null) {
     serverButtonsBottom.refresh(instance);
     serverDesc.show(instance);
   } else {
     serverButtonsBottom.initialize();
     serverDesc.initialize();
   }
 }