I created a new class DSW.Addons.htmlViewer:
Class DSW.Addons.htmlViewer Extends %DeepSee.Component.Portlet.abstractPortlet
Property Data As %String;
ClassMethod %OnGetPortletSettings(Output pInfo As %List, ByRef pSettings) As %Status
Set pInfo(1) = $lb("Data", , , "Data", "Data setting")
It's a ZEN component and DeepSee portlet. It's immediately available in the namespace I created it in. DSW package is mapped to %ALL and to Samples, but if I try to create a widget with this portlet I get ZEN class not found error.