Top Style (borderTopStyle)
The Top Style property sets the style of the top border of a report object.
The Top Style property overrides the Style property for the top 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 Top Style property in the Border category of the Properties view.