Correct the Top Navigation in Metro theme with Genesis 2.0

function.php

// Adds widget area before the .menu on #subnav
add_filter( 'genesis_do_subnav', 'child_do_subnav_widget', 10, 2 );
function child_do_subnav_widget( $subnav_output, $subnav ){
  ob_start();
	genesis_widget_area( 'subnav-left', array(
		'before' => '<div class="subnav-left widget-area">',
		'after' => '</div>'
	) );
	$widget_area = ob_get_clean();

	return str_replace( $subnav, $widget_area . $subnav, $subnav_output );
}