if (getFXMLItem() != null) {
     this.fxmlComponent = getFXMLItem().get();
} else if (getFXMLPath() != null) {
     this.fxmlComponent = FXMLUtils.loadFXML(this, getFXMLPath(), getFXMLBundlePath());
}

/**
 * Inform if the model will be displayed multiple times on screen
 * As consequence the FXMLItem will provide a new FXMLComponent instance to avoid
 * duplicate children on the scene graph
 *
 * @return true is the node mus
 */
 protected boolean duplicateOnScreen() {
    return false;
 }

 /**
  * {@inheritDoc}
  */
  @Override
  protected final void initInternalModel() throws CoreException {
     [... DO THINGS ...]

     if (getFXMLItem() != null) {
         if (!duplicateOnScreen()) {
             this.fxmlComponent = getFXMLItem().get();
         } else {
             this.fxmlComponent = getFXMLItem().getNew();
         }
         // Don't forget to set the model to the controller here cause of FXMLBuilder#buildComponent
         this.fxmlComponent.getController().setModel(this);
     } else if (getFXMLPath() != null) {
         this.fxmlComponent = FXMLUtils.loadFXML(this, getFXMLPath(), getFXMLBundlePath());
     }

      [... DO OTHERS THINGS ...]
  }