如何在zedgraph中绘制条形图中相邻的条形图？

using ZedGraph;

// 创建 ZedGraphControl 控件
ZedGraphControl zedGraphControl = new ZedGraphControl();

// 初始化图表属性
GraphPane graphPane = zedGraphControl.GraphPane;
graphPane.Title.Text = "相邻的条形图";
graphPane.XAxis.Title.Text = "X 轴";
graphPane.YAxis.Title.Text = "Y 轴";

// 创建条形图对象
BarItem barItem1 = new BarItem("条形图1", new double[] { 1, 2, 3, 4 });
BarItem barItem2 = new BarItem("条形图2", new double[] { 5, 6, 7, 8 });

// 设置条形图属性
barItem1.Bar.Fill = new Fill(Color.Red);
barItem2.Bar.Fill = new Fill(Color.Blue);

// 创建条形图集合
BarItemList barItemList = new BarItemList();
barItemList.Add(barItem1);
barItemList.Add(barItem2);

// 将条形图集合添加到 GraphPane 对象中
graphPane.BarSettings.Type = BarType.Cluster;
graphPane.BarSettings.ClusterScaleWidth = 1.0;
graphPane.BarSettings.MinClusterGap = 0.0;
graphPane.BarSettings.MinBarGap = 0.0;
graphPane.CurveList.AddRange(barItemList);

// 将 GraphPane 对象添加到 ZedGraphControl 控件中
zedGraphControl.AxisChange();

// 重新绘制图表
zedGraphControl.Invalidate();