While reading the question asked by DVK, I wondered when Anakin became eligible to train his own padawan. At the conclusion of Star Wars Episode 2 Anakin is still considered Padawan learner and during Episode 3 Anakin complains to Palpatine that he is ready for the Master trials but Master Yoda doesn't think so. Yet in the cartoon series The Clone Wars he has his own padawan, Ashoka.
It was in the 2003 series (directed by Genndy Tartakovsky), not the CGI ones. In the first episode of season 3. You can see the episode list in wikipedia
In the 'Legends' canon, Anakin was knighted in a secret ceremony after the Battler of Praesitlyn without the customary trials because he has proven to be a worthy jedi during the clone wars.
In the new Disney canon his 'graduation' has not been addressed.
more info about this in wookiepedia.
Anakin is knighted and loses his braid at the end of Clone Wars: Chapter 21