Two quick notes related to Control Bars in Flex. First, I was trying to get an ApplicationControlBar to dock to the bottom of the app, which I couldn’t get to work. Maybe someone could point out a better solution, but I went with using a DockableToolbar from the awesome flexlib and setting draggable=false.
The other thing is if you want a ControlBar at the top of a panel, you can just actually just use an ApplicationControlBar wrapped in a VBox.