ChartFillFormat Object
Office 2013
Published: July 16, 2012
Represents fill formatting.
Use the Fill property to return the ChartFillFormat object. The following example sets the foreground color, background color, and gradient for the chart area fill in myChart.
With myChart.ChartArea.Fill
.Visible = True
.ForeColor.SchemeColor = 15
.BackColor.SchemeColor = 17
.TwoColorGradient msoGradientHorizontal, 1
End With