Gets the settings of the tabbed layout group bottom border.
A Border object that represents the bottom border settings.
The BorderBottom property provides access to the settings that define the width, style, and color values for the bottom border of the corresponding object to which the current style applies.
In order to define border settings for all four sides at the same time, use the AppearanceStyleBase.Border property. Note that border settings which are set by using the BorderBottom property override the corresponding settings defined via the AppearanceStyleBase.Border property.