Section 6.2.4 Layouts with Sitemesh:
http://grails.org/doc/latest/guide/6.%20The%20Web%20Layer.html#6.2.4 Layouts with Sitemesh
layouts exist in the /grails-app/views/layout/ folder.
They can be specified in the gsp:
In the controller:
'by convention', where controller could be called 'BookController' and a layout exists called 'book.gsp'. For each view delegated to from BookController, that layout is used.
We should provide navigation to the layout from the gsp and the controller layout field. Perhaps a quick way for the convention case too (expand the options under the 'goto gsp' icon on the toolbar?)