We need to customize
newdocset.aspx of document set in SharePoint 2010. Currently reference is given to
_layouts folders application pages. Did lot of research, but I got no where.
migrated from stackoverflow.com Feb 15 '13 at 15:23
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Microsoft has a sample of how to do this on MSDN. You would basically create an Application Page that serves the same function and then set the "new" url of the document set content type (or your custom one build on it) to that new page: