The backplane applied on the legend.
The following example changes the legend background to red.
Dim legend As Legend = CType((NChartControl.Legends(0)), Legend)
legend.Backplane.Visible = True
legend.Backplane.FillEffect.SetSolidColor(Color.Red)
Legend legend = (Legend)(NChartControl.Legends[0]);
legend.Backplane.Visible = true;
legend.Backplane.FillEffect.SetSolidColor(Color.Red);
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2