Plone 4.1 commenting does not show up on SunBurst theme -

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i have plone 4.1 plone.app.discussion = 2.1.5 , quintagroup.plonecomments. also, have several sites configured commenting globally on simple page. first 1 works should, commenting not show @ all. moreover, second 1 has sunburst theme , gues theme not include plone.comments viewlet, because when used @@manage-viewlets on first site, showed , when used on other 1 - no sign of plone.comments. how can enable viewlet?


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