How to make this in Java (MenuBar with drop down)?

In MSN Messenger they use this type of control everywhere.

http://i.stack.imgur.com/Uatm3.png

In the GUI of an application I am makin开发者_运维技巧g I really want to use something of this nature. Any ideas on how to make something like this?

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I think these are often called SplitButtons.

• There is a JavaLobby article about creating something oneself.
• The JIDE library has a widget called JideSplitButton.
• The Japura project has a split button widget.
• ... and of course ask Google for more ...