How to quit a GUI application in SWT?

Hi,
I am working on a GUI application and I use SWT.

I wonder how I can quit this application by clicking a button in the toolbar just like closing it by pressing the x sign on the corner of the window.

This is the code that creates the quit icon :

       

CustomToolbar custToolBar33333 = new CustomToolbar(compTB3, SWT.FLAT, "Next Actions");      
    
        item33333333 = new ToolItem(custToolBar33333.getToolBar(), SWT.PUSH);
        item33333333.setImage(image_exit); item33333333.setText("Quit"); item33333333.setToolTipText("Quit the tool");
        item3333333.addListener(SWT.Selection, toolBarListener);

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