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No of the alert/confirm/prompt panels gets displayed in HTMLUI embedded in NetBeans.
https://hg.netbeans.org/ergonomics/rev/311eed875cac
Integrated into 'main-silver', will be available in build *201509290002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/311eed875cac User: Jaroslav Tulach <jtulach@netbeans.org> Log: #255581: Providing special handlers for alert/confirm/prompt