Returns a top level named portlet instance.
Parameters: window - the window of the portlet instance the target instance or null if it cannot be found throws: IllegalArgumentException - if the window is null
Returns a contextualized portlet instance for the specified user id. If the window is in the context of a
dashboard then the portlet instance is further customized for that specific window.
Parameters: window - the window of the portlet instance Parameters: user - the user that can be null the target instance or null if it cannot be found throws: IllegalArgumentException - if the window is null