The TabItem.Style property of a particular tab has priority over that property.
This property is merged with the this.ControlStyle. It means that if the BackColor, ForeColor, Font, or sub-properties related to the border are not set, then values of corresponding properties of the this.ControlStyle are used.
When this property is set, then the reference to the original Style object remains the same, and Style-subproperties are copied using the Style.CopyFrom(...) method.
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