Apply format style to tinymce

Question

I'm trying to insert style in my tinymce. I want to format text in pre tags with class pretyprint. I managed to add pre tags, but class isn't added. it adds class if i change pre to eg div

{title: 'code', 'inline-block': 'pre', classes: 'prettyprint'},

Answer 1

        {title: 'code', 'block':'pre', classes:'prettyprint linenum'},