@Override
public void changed(ObservableValue<? extends TreeItem<DisplayWorkflowClassesModel>> observable,
TreeItem<DisplayWorkflowClassesModel> oldValue, TreeItem<DisplayWorkflowClassesModel> newValue) {
if (observable != null && newValue!=null && newValue.getValue()!=null /*&& newValue.getChildren().isEmpty()*/){
WorkflowVersion workflowClassesModel = newValue.getValue().value;
selectedItem.set(workflowClassesModel);
expand(newValue);
}
}