Thanks. I kind of figured that after playing around with it.
There is a bug in the designer, tho. When you drag an existing JSP page (from the package explorer) to the editor, the default ID is the path with slashes. These slashes need to be replaced with either underscores or dashes. I’d say two underscores and maybe replace dots with dashes. For instance, “/admin/UpdateUser.jsp” could be changed to “admin__UpdateUser-jsp”.