wysiwyg+example
Our *tinyMCE card here on wagn.org has:
theme_advanced_buttons1 : "formatselect,bold,italic,"
The "formatselect" is what makes the menu appear in our edit toolbar, and the "bold" and "italic" puts the corresponding buttons there as well:
There's also a line with:
theme_advanced_blockformats : "p,h1,h2,pre",
...which is why the menu offers Paragraph, Heading 1, Heading 2, and Preformatted.