A decoration renderer is responsible for generating the markup of the portlet window title bar.
The decoration
renderer has the responsibility to create the title , the window state links, and the portlet mode links. It is
intended to be called by the WindowRenderer to produce part of the markup of a portlet wiindow. The
other parts are intended to be created by the PortletRenderer, and the WindowRenderer
itself.
Create the markup for the portlet decoration
Parameters: rendererContext - the state holder to provide information about the region, it's portlets, and the renderset, which allows access to the other renderer interfaces of the render set. throws: org.jboss.portal.theme.render.RenderException -