docs: public void addToolbarComponent(BaseComponent component, String action) {
          BaseComponent ref = toolbar.getFirstChild();
          
          if (component instanceof Toolbar) {
              BaseComponent child;
              
              while ((child = component.getFirstChild()) != null) {
                  toolbar.addChild(child, ref);
              }
              
          } else {
              toolbar.addChild(component, ref);
              ActionUtil.addAction(component, action);
          }
      }