Instances of this class support the layout of selectable
tool bar items.
The item children that may be added to instances of this class
must be of type
Note that although this class is a subclass of
it does not make sense to add
Control children to it,
or set a layout on it.
FLAT, RIGHT, HORIZONTAL, VERTICAL
Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
IMPORTANT: This class is not intended to be subclassed.