How to add a dropdown menu to toolbar in NetBeans Platform

To add a dropdown menu to toolbar, you should extends CallableSystemAction and override method:

public Component getToolbarPresenter()

Dropdown menu should be banded with a JToggleButton, when JToggleButton is pressed down, show a JPopupMenu on JToggleButton.

Example: 

public class PickDrawingLineAction extends CallableSystemAction {
    private static JToggleButton toggleButton;
    private static ButtonGroup buttonGroup;
    private static JPopupMenu popup;
    private MyMenuItemListener menuItemListener;
    
    List

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