Bottom Style (borderBottomStyle)
The Bottom Style property sets the style of the bottom border of a report object.
The Bottom Style property overrides the Style property for the bottom border.
Type: Enum.
Valid values: 
        - none
 - solid
 - dotted
 - dashed
 - groove
 - ridge
 - inset
 - outset
 - double
 
Default value: Value of the Style property.
You can find the Bottom Style property in the Border category of the Properties view.