A family of Microsoft word processing software products for creating web, email, and print documents.
Rather than depend on these buttons, go to the Paragraph dialog (easiest way is to right-click and choose Paragraph...) and choose your desired settings. Better still, define a style that has your preferred settings and apply it as required. See also
http://wordfaqs.ssbarnhill.com/CustomizeNormalTemplate.htm#Word2010Paragraph