guasi

Here is the code to create your own plugin to edit the ‘theme_advanced_blockformats’ string. It works for me using 2.8.5

function customformatTinyMCE($init) {
	// Add block format elements you want to show in dropdown
	$init['theme_advanced_blockformats'] = 'p,h3,h4,h5,h6';

	// Add elements not included in standard tinyMCE doropdown p,h1,h2,h3,h4,h5,h6
	//$init['extended_valid_elements'] = 'code[*]';

	return $init;
}

// Modify Tiny_MCE init
add_filter('tiny_mce_before_init', 'customformatTinyMCE' );