[wp-hackers] Add a button to TinyMCE to add p.class

[Andrew Ozz]

Jeremy Clarke wrote:
> Omg would I also love someone to make this something I can add to WP
> easily. Even just having a template for a  "tinymce plugin" (i.e. the
> mce plugin rather than the wp plugin that would be used to inject the
> mce plugin)...

The template is in the TinyMCE manual. Have a look at 
http://wiki.moxiecode.com/index.php/TinyMCE:Create_plugin/3.x

Also have a look at the API, specifically the DOMUtils class:
http://wiki.moxiecode.com/index.php/TinyMCE:API/tinymce.dom.DOMUtils

And of course download the full TinyMCE and have a look at the included 
plugins. There are a few examples of adding a button that would do 
simple addClass to the parent P tag.