[Browsable(false)]
[DefaultValue(null)]
public DashboardLayoutGroup LayoutRoot { get; set; }

<Browsable(False)>
<DefaultValue(Nothing)>
Public Property LayoutRoot As DashboardLayoutGroup

using System;
using System.Linq;
using DevExpress.XtraEditors;
using DevExpress.DashboardCommon;
using DevExpress.DashboardWin;
using System.IO;

namespace Dashboard_LayoutCustomization
{
    public partial class Form1 : XtraForm
    {
        public Form1()
        {
            InitializeComponent();
            dashboardViewer1.CustomizeDashboardTitle += DashboardViewer1_CustomizeDashboardTitle;
            dashboardViewer1.LoadDashboard(@"Data\LayoutUnordered.xml");
        }

        private void ChangeLayout(DashboardToolbarItemClickEventArgs args)
        {
            Dashboard dashboard = new Dashboard();
            dashboard.LoadFromXml(@"Data\LayoutUnordered.xml");
            dashboard.BeginUpdate();
            // Switch off the DateFilter item's AutoHeight arrangement mode so that the DateFilter layout does not ignore its layout weight.
            ((DateFilterDashboardItem)(dashboard.Items["dateFilterDashboardItem1"])).ArrangementMode = DateFilterArrangementMode.Horizontal;
            // Hide captions.
            dashboard.Items.ForEach(item => item.ShowCaption = false);
            dashboard.Groups.ForEach(item => item.ShowCaption = false);
            // Create layout items for the DateFilter and Chart dashboard items.
            DashboardLayoutItem dateFilterLayoutItem = new DashboardLayoutItem(dashboard.Items["dateFilterDashboardItem1"], 13);
            DashboardLayoutItem chartLayoutItem = new DashboardLayoutItem(dashboard.Items["chartDashboardItem1"], 87);
            // Create a layout item for the dashboard Group item.
            DashboardLayoutGroup groupLayoutItem = new DashboardLayoutGroup()
            {
                Orientation = DashboardLayoutGroupOrientation.Vertical,
                DashboardItem = dashboard.Groups["dashboardItemGroup1"],
                Weight = 70
            };
            // Connect layout items in the layout tree.
            groupLayoutItem.ChildNodes.AddRange(dateFilterLayoutItem, chartLayoutItem);
            // Create a Grid layout item.
            DashboardLayoutItem gridLayoutItem = new DashboardLayoutItem(dashboard.Items["gridDashboardItem1"], 30);
            // Create a group layout item to organize the Grid layout item and a Dashboard Group layout item.
            DashboardLayoutGroup layoutGroup = new DashboardLayoutGroup(DashboardLayoutGroupOrientation.Horizontal, 85);
            // Connect layout items in the layout tree.
            layoutGroup.ChildNodes.AddRange(gridLayoutItem, groupLayoutItem);
            // Create a RangeFilter layout item.
            DashboardLayoutItem rangeFilterLayoutItem = new DashboardLayoutItem(dashboard.Items["rangeFilterDashboardItem1"], 15);            
            // Create a root layout group. Its DashboardItem property is null.
            DashboardLayoutGroup rootGroup = new DashboardLayoutGroup()
            {
                Orientation = DashboardLayoutGroupOrientation.Vertical,
                Weight = 100,
                DashboardItem = null
            };
            // Connect layout items in the layout tree. 
            rootGroup.ChildNodes.AddRange(layoutGroup, rangeFilterLayoutItem);
            // The layout treee is built. Set the dashboard's root layout node to finalize the layout.
            dashboard.LayoutRoot = rootGroup;
            dashboard.EndUpdate();

            dashboardViewer1.Dashboard = dashboard;
        }

        private void RepositionItems(DashboardToolbarItemClickEventArgs args)
        {
            Dashboard dashboard = dashboardViewer1.Dashboard;
            DashboardLayoutGroup rootGroup = dashboard.LayoutRoot.ChildNodes[0] as DashboardLayoutGroup;
            if ((rootGroup != null) && (rootGroup.ChildNodes.Count > 1))
                rootGroup.ChildNodes[0].MoveRight(rootGroup.ChildNodes[1]);
        }

        private void SaveLayoutToFile(DashboardToolbarItemClickEventArgs args)
        {
            dashboardViewer1.SaveDashboardLayout("DashboardLayout.xml");
        }

        private void LoadLayoutFromFile(DashboardToolbarItemClickEventArgs obj)
        {
            if (File.Exists("DashboardLayout.xml"))
                dashboardViewer1.LoadDashboardLayout("DashboardLayout.xml");
        }

        private void DashboardViewer1_CustomizeDashboardTitle(object sender, CustomizeDashboardTitleEventArgs e)
        {
            var exportItem = e.Items.FirstOrDefault(i => i.ButtonType == DashboardButtonType.Export);
            if (exportItem != null)
                e.Items.Remove(exportItem);
            DashboardToolbarItem btnChangeLayout = new DashboardToolbarItem();
            btnChangeLayout.Caption = "Change Layout";
            btnChangeLayout.ClickAction = new Action<DashboardToolbarItemClickEventArgs>(ChangeLayout);
            e.Items.Add(btnChangeLayout);
            DashboardToolbarItem btnRepositionItems = new DashboardToolbarItem();
            btnRepositionItems.Caption = "Reposition Items";
            btnRepositionItems.ClickAction = new Action<DashboardToolbarItemClickEventArgs>(RepositionItems);
            e.Items.Add(btnRepositionItems);
            DashboardToolbarItem btnSaveLayout = new DashboardToolbarItem();
            btnSaveLayout.Caption = "Save Layout to File";
            btnSaveLayout.ClickAction = new Action<DashboardToolbarItemClickEventArgs>(SaveLayoutToFile);
            e.Items.Add(btnSaveLayout);
            DashboardToolbarItem btnLoadLayout = new DashboardToolbarItem();
            btnLoadLayout.Caption = "Load Layout from File";
            btnLoadLayout.ClickAction = new Action<DashboardToolbarItemClickEventArgs>(LoadLayoutFromFile);
            e.Items.Add(btnLoadLayout);
        }
    }
}

Imports System
Imports System.Linq
Imports DevExpress.XtraEditors
Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardWin
Imports System.IO

Namespace Dashboard_LayoutCustomization
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
            AddHandler dashboardViewer1.CustomizeDashboardTitle, AddressOf DashboardViewer1_CustomizeDashboardTitle
            dashboardViewer1.LoadDashboard("Data\LayoutUnordered.xml")
        End Sub

        Private Sub ChangeLayout(ByVal args As DashboardToolbarItemClickEventArgs)
            Dim dashboard As New Dashboard()
            dashboard.LoadFromXml("Data\LayoutUnordered.xml")
            dashboard.BeginUpdate()
            ' Switch off the DateFilter item's AutoHeight arrangement mode so that the DateFilter layout does not ignore its layout weight.
            CType(dashboard.Items("dateFilterDashboardItem1"), DateFilterDashboardItem).ArrangementMode = DateFilterArrangementMode.Horizontal
            ' Hide captions.
            dashboard.Items.ForEach(Sub(item) item.ShowCaption = False)
            dashboard.Groups.ForEach(Sub(item) item.ShowCaption = False)
            ' Create layout items for the DateFilter and Chart dashboard items.
            Dim dateFilterLayoutItem As New DashboardLayoutItem(dashboard.Items("dateFilterDashboardItem1"), 13)
            Dim chartLayoutItem As New DashboardLayoutItem(dashboard.Items("chartDashboardItem1"), 87)
            ' Create a layout item for the dashboard Group item.
            Dim groupLayoutItem As New DashboardLayoutGroup() With {.Orientation = DashboardLayoutGroupOrientation.Vertical, .DashboardItem = dashboard.Groups("dashboardItemGroup1"), .Weight = 70}
            ' Connect layout items in the layout tree.
            groupLayoutItem.ChildNodes.AddRange(dateFilterLayoutItem, chartLayoutItem)
            ' Create a Grid layout item.
            Dim gridLayoutItem As New DashboardLayoutItem(dashboard.Items("gridDashboardItem1"), 30)
            ' Create a group layout item to organize the Grid layout item and a Dashboard Group layout item.
            Dim layoutGroup As New DashboardLayoutGroup(DashboardLayoutGroupOrientation.Horizontal, 85)
            ' Connect layout items in the layout tree.
            layoutGroup.ChildNodes.AddRange(gridLayoutItem, groupLayoutItem)
            ' Create a RangeFilter layout item.
            Dim rangeFilterLayoutItem As New DashboardLayoutItem(dashboard.Items("rangeFilterDashboardItem1"), 15)
            ' Create a root layout group. Its DashboardItem property is null.
            Dim rootGroup As New DashboardLayoutGroup() With {.Orientation = DashboardLayoutGroupOrientation.Vertical, .Weight = 100, .DashboardItem = Nothing}
            ' Connect layout items in the layout tree. 
            rootGroup.ChildNodes.AddRange(layoutGroup, rangeFilterLayoutItem)
            ' The layout treee is built. Set the dashboard's root layout node to finalize the layout.
            dashboard.LayoutRoot = rootGroup
            dashboard.EndUpdate()

            dashboardViewer1.Dashboard = dashboard
        End Sub

        Private Sub RepositionItems(ByVal args As DashboardToolbarItemClickEventArgs)
            Dim dashboard As Dashboard = dashboardViewer1.Dashboard
            Dim rootGroup As DashboardLayoutGroup = TryCast(dashboard.LayoutRoot.ChildNodes(0), DashboardLayoutGroup)
            If (rootGroup IsNot Nothing) AndAlso (rootGroup.ChildNodes.Count > 1) Then
                rootGroup.ChildNodes(0).MoveRight(rootGroup.ChildNodes(1))
            End If
        End Sub

        Private Sub SaveLayoutToFile(ByVal args As DashboardToolbarItemClickEventArgs)
            dashboardViewer1.SaveDashboardLayout("DashboardLayout.xml")
        End Sub

        Private Sub LoadLayoutFromFile(ByVal obj As DashboardToolbarItemClickEventArgs)
            If File.Exists("DashboardLayout.xml") Then
                dashboardViewer1.LoadDashboardLayout("DashboardLayout.xml")
            End If
        End Sub

        Private Sub DashboardViewer1_CustomizeDashboardTitle(ByVal sender As Object, ByVal e As CustomizeDashboardTitleEventArgs)
            Dim exportItem = e.Items.FirstOrDefault(Function(i) i.ButtonType = DashboardButtonType.Export)
            If exportItem IsNot Nothing Then
                e.Items.Remove(exportItem)
            End If
            Dim btnChangeLayout As New DashboardToolbarItem()
            btnChangeLayout.Caption = "Change Layout"
            btnChangeLayout.ClickAction = New Action(Of DashboardToolbarItemClickEventArgs)(AddressOf ChangeLayout)
            e.Items.Add(btnChangeLayout)
            Dim btnRepositionItems As New DashboardToolbarItem()
            btnRepositionItems.Caption = "Reposition Items"
            btnRepositionItems.ClickAction = New Action(Of DashboardToolbarItemClickEventArgs)(AddressOf RepositionItems)
            e.Items.Add(btnRepositionItems)
            Dim btnSaveLayout As New DashboardToolbarItem()
            btnSaveLayout.Caption = "Save Layout to File"
            btnSaveLayout.ClickAction = New Action(Of DashboardToolbarItemClickEventArgs)(AddressOf SaveLayoutToFile)
            e.Items.Add(btnSaveLayout)
            Dim btnLoadLayout As New DashboardToolbarItem()
            btnLoadLayout.Caption = "Load Layout from File"
            btnLoadLayout.ClickAction = New Action(Of DashboardToolbarItemClickEventArgs)(AddressOf LoadLayoutFromFile)
            e.Items.Add(btnLoadLayout)
        End Sub
    End Class
End Namespace

// Specify the target dashboard's layout tab page as the parent container instead of the former layout root group.
LayoutMerger.MergeLayout(dashboard.LayoutRoot, dashboard.Title.Text, this);
return true;

DashboardLayoutGroup layoutRoot = originalDashboard.LayoutRoot;
layoutPage.ChildNodes.Add(layoutRoot);

// The layout treee is built. Set the dashboard's root layout node to finalize the layout.
dashboard.LayoutRoot = rootGroup;
dashboard.EndUpdate();

50D, cardLayoutItem, chartLayoutItem);
dBoard.LayoutRoot = rootGroup;

' Specify the target dashboard's layout tab page as the parent container instead of the former layout root group.
LayoutMerger.MergeLayout(dashboard.LayoutRoot, dashboard.Title.Text, Me)
Return True

Dim layoutRoot As DashboardLayoutGroup = originalDashboard.LayoutRoot
layoutPage.ChildNodes.Add(layoutRoot)

' The layout treee is built. Set the dashboard's root layout node to finalize the layout.
dashboard.LayoutRoot = rootGroup
dashboard.EndUpdate()

Dim rootGroup As DashboardLayoutGroup = New DashboardLayoutGroup(DashboardLayoutGroupOrientation.Vertical, 50R, cardLayoutItem, chartLayoutItem)
dBoard.LayoutRoot = rootGroup
Return dBoard