guys... there´s one way to dock something in the bottom?
like ApplicationControlBar do (but not in the top)
i want to do this in the bottom... how can i do that?
Rather then using the application control bar you could just use a standard control bar and extend it to do what you wish. It can them be placed where ever you wish. You can attach it to the bottom of the screen in several different ways such as listening for stage resize events and repositioning as needed or simply using the bottom property.
Alternatly you might want to consider using a Flex 4 code to simply draw yourself a rectangle and placing an HGroup tag inside it and then adding whatever functionality you desire. This might be a better solution in the long run. It would require more custom code but allows for greater flexibility.