Subclasses of TBarButton must provide a Button property that returns themselves downcast as an instance of TBarButton. This property is used by UltraWebToolbar to provide design-time and serialization features to arbitrary TBarButton subclasses.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2