After creating a TBButtonGroup, it is essential that it immediately be added to the Items collection on the UltraWebToolbar prior to it being receiving buttons or having it's property values set. Failure to do so may result in changes to the button group not being properly reflected in viewstate.
Following this, developers may want to assign a Key to the button group to make it easy to locate within the Items collection.
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