Represents the border of the specified object.
Using the Border Object
An object's border is treated as a single entity and is always returned as a unit (in its entirety), regardless of how many sides it has. Use the Border property to return the Border object. The following example places a dashed border around the chart area and places a dotted border around the plot area.
With myChart .ChartArea.Border.LineStyle = xlDash .PlotArea.Border.LineStyle = xlDot End With