By default, the width of 8px is used for a separator. However, if an Image is specified, developers may need to set an explicit value for this property to prevent the image from being clipped.
Note: Because UltraWebToolbar is rendered as a fixed-layout <table>, it is not recommended that Unit.Empty. Such a setting may lead to inconsistent layout across different browser platforms. The width of the image cannot be auto-detected.
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