How to register an action for nodes like Source packages

Manikantan Narender nath <[email protected]>
Newsgroups gmane.comp.java.netbeans.modules.openide.devel
Message-ID <CAKu9P493HD9uvLMK1Z_fbnGOBPzRtmq==VLyhirqxG85xy81Dg@mail.gmail.com> 
Hi,
I have a plugin which creates an archive using the selected nodes.
How do I register the action in the context menu for nodes like Source
Packages, site root etc.

*Cheers*
Mani/Naren/Iyer
*The trick of walking on water is knowing where the stones are.*
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