Help me on toolbar problem

[Sam Hu]

Hi there,

I am reading SWT: A Developer's Notebook and tried some code in the book,sure I also tried to re-organize the structure and to see what happens.In the attached simple code,the Option menu,Window menu and toobar item CHECK does not work properly.When I click on it,the application quit immediatley.I don't know why.

Can anyboy help me?
Thanks and best Regards,
Sam
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