Invisible Beans

You can add an Invisible bean to your hierarchy by deselecting everything in the hierarchy, and clicking on an invisible bean in the palette. This results in the invisible bean appearing in your hierarchy as a new root bean. You can treat an invisible bean exactly as would treat any other component in the hierarchy.
You can edit their properties with the Property Editor, access customizers (if they have any), you can bind events to them in the Event Bindings editor, and you can cut, copy, paste, and delete them.
Examples of invisible beans are: CheckboxGroup, ResourceBundle, and if you have the Swing components loaded, ButtonGroup.