Extend class view

"robo__" <[email protected]>
Newsgroups gmane.comp.java.netbeans.modules.openide.devel
Message-ID <[email protected]> 
Hi,

I'm new in netbeans. I want to add some custom funcionality of class view that I very need. 
Normally when user view class file there is "Attache Sources" button.

I want to add to that view my custom button.

Could you help me to do that ? I don't know openide API maybe someone could help me find best way to add new button to that class view
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