Missing Wordpress WYSIWYG formatting tools

I am trying my hand at developing a Wordpress theme, however I seem to have hit a little snag. When creating posts in Wordpress you have the WYSIWYG content area.

At present, mine looks like this:

Missing some formatting tools http://www.threethinkers.co.uk/stackover开发者_StackOverflow社区flow/missing.jpg.

However, I would like to make available the following additional formatting tools:

Missing some formatting tools http://www.threethinkers.co.uk/stackoverflow/not.missing.jpg.

Does anybody know if this a plugin or do I need to enable something inside Wordpress?

Although I usually get on great with Google, I don't think I am using the correct search terms as the results tend to be off track.

Any help is appreciated - but my preference would be a way of implementing this myself rather than using a plugin.

That looks like the kitchen sink, which can be expanded by clicking the first button on the right in the first picture.