the default list method in generated controllers looks like this:
<code> @Property list = { [ exampleList: Example.list( params ) ] } </code>
This can be changed to return results however you need. For example, to execute an HQL statement to return the results in reverse order of id, use the following:
<code> @Property list = { [ exampleList: Example.findAll( "from Example order by id desc", params ) ] } </code>