I have following problem:

I want users to format text paragraphs with different classes, i.e. <p class="greenText_indented80"> or <p class="bluebox_textsize12">.

 
When I work with "Css Class", only <span class=...> tags will be inserted.
Wehn working with "Paragraph", only <p> or <h3> tags will be inserted without class information.

How can I solve this problem?