Method XbpToolBarButton():clear() Foundation
Removes all menu items defined for a tool bar button's drop-down menu.
:clear() => self:clear() returns the object executing the method (self).
After a tool bar button is added to a toolbar, the method :clear() can be used to remove/clear all menu items defined for its drop-down menu. After :clear() is called, the method :numItems() returns zero and selecting the toolbar button's drop-down arrow has no effect.
Drop-menus are only supported for tool bar button objects that have the XBPTOOLBAR_BUTTON_DROPDOWN style. See the instance variable :style for further information.
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