DevExpress.XtraBars.Docking.DockPanel panel0 = this.dockManager1.AddPanel(DockingStyle.Left);
            panel0.Text = "panel0";
            
            DevExpress.XtraBars.Docking.DockPanel panel1= panel0.AddPanel();
            panel1.TabText = "Tab1";
            DevExpress.XtraBars.Docking.DockPanel panel2 = panel1.AddPanel();
            panel2.TabText = "Tab2";
            panel2.DockAsTab(panel1);