The DefaultStyle is the style which is applied to a button in this group, when not selected, or moused over (e.g., in the "up" position). When explicitly set on the TBButtonGroup, the DefaultStyle overrides DefaultStyle on the UltraWebToolbar element, and is itself overridden by DefaultStyle on the TBarButton object.
Designers may force the TBarButton to employ a specific style by assigning the name of a class to the CssClass property. Force the use of no style, by specifying "none" for the CssClass property.
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