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<?php
// Add support for Genesis layouts to listings post type
add_post_type_support( 'CPTNAME', 'genesis-layouts' );

// Force layout on custom post type
add_filter('genesis_site_layout', 'ts_CPTNAME_layout');
function ts_CPTNAME_layout($opt) {
if ( 'CPTNAME' == get_post_type() )
$opt = 'full-width-content';
return $opt;
}
?>