Change the language of application using ResourceBundle

Question

I'm building a internationalized application based of Java using Netbeans IDE, I´m trying to change the language of my frames using a combobox located in a singular frame, but I cant make the code for do that, can any help me?

The combobox contains a some Objects with a Local value identifier. I want to take this value and change the Locale of the frames, then change the languages of the Frames.

I tried to change the base Local, but that does not work. What do I do?