The mania that has buttons on the Apple patent is somewhat long, in fact, the first Macintosh did not include a button to eject the floppy, so that was done by software.
Luckily offer many options to eject the CD and DVD. It can be done using the keyboard, dragging the disk to the trash by right clicking on the disk, etc. from the Finder. That is, for options will not be. But besides all that, there is a more interesting from the taskbar.
To activate a button "remove" from the taskbar, we need to access the path:
System > Library > CoreServices > Menu Extras
Once we are in this menu, you have to run the file "Eject.menu . Once done, this will activate a new button from which we can eject any disc inserted in our Mac SuperDrive.