Layout Container

A Box container lays out its children in a single vertical column or a single horizontal row. The direction property determines whether to use vertical (default) or horizontal layout.
The Box class is the base class for the VBox and HBox classes. You use the mx:Box, mx:VBox, and mx:HBox tags to define Box containers.
Properties :
Direction=Horizontal |Vertical
*The direction in which this Box container lays out its children. MXML values are "horizontal" and "vertical". Possible values in ActionScript are *BoxDirection.HORIZONTAL and BoxDirection.VERTICAL.
The default value is BoxDirection.VERTICAL