I am facing the problem with opening of multiple windows

I am facing the problem with opening of multiple windows

Whenever I right-click the menu item , I am able to open multiple windows of the same element or Instance. Since we are using JApplet the init() takes care of opening of new windows.
My requirement is to open or show only a single(same) window even when user clicks the same menu item for several times.
Please help me in achieving the above.

Thanks.



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