[DefaultValue(false)]
public bool CalculateHiddenTotals { get; set; }

<DefaultValue(False)>
Public Property CalculateHiddenTotals As Boolean

using DevExpress.DashboardCommon;
using DevExpress.DashboardCommon.ViewerData;
using DevExpress.DashboardWin;
using System.Data;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace CalculateHIddenTotalsExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            dashboardViewer1.CalculateHiddenTotals = true;
            dashboardViewer1.ConfigureDataConnection += DashboardViewer1_ConfigureDataConnection;
            dashboardViewer1.CustomizeDashboardItemCaption += DashboardViewer1_CustomizeDashboardItemCaption;

            // Load the dashboard after all DashboardViewer options are set.
            dashboardViewer1.DashboardSource = typeof(Dashboard1);
        }
        private void DashboardViewer1_CustomizeDashboardItemCaption(object sender, CustomizeDashboardItemCaptionEventArgs e)
        {
            DashboardViewer viewer = (DashboardViewer)sender;
            if (e.DashboardItemName == "pieDashboardItem1")
            {
                DashboardToolbarItem infoButton = new DashboardToolbarItem();
                MultiDimensionalData mData = viewer.GetItemData(e.DashboardItemName);
                var orderCount = mData.GetValue(mData.GetMeasures().Where(m => m.DataMember == "OrderID").First()).Value ?? 0;
                e.FilterText += string.Format("{0:N0} distinct orders are displayed", orderCount);
            }
        }

        private void DashboardViewer1_ConfigureDataConnection(object sender, DashboardConfigureDataConnectionEventArgs e)
        {
            ExtractDataSourceConnectionParameters parameters = e.ConnectionParameters as ExtractDataSourceConnectionParameters;
            if (parameters != null) parameters.FileName = Path.GetFileName(parameters.FileName);
        }

    }
}

Imports DevExpress.DashboardCommon
Imports DevExpress.DashboardCommon.ViewerData
Imports DevExpress.DashboardWin
Imports System.Data
Imports System.IO
Imports System.Linq
Imports System.Windows.Forms

Namespace CalculateHIddenTotalsExample
    Partial Public Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
            dashboardViewer1.CalculateHiddenTotals = True
            AddHandler dashboardViewer1.ConfigureDataConnection, AddressOf DashboardViewer1_ConfigureDataConnection
            AddHandler dashboardViewer1.CustomizeDashboardItemCaption, AddressOf DashboardViewer1_CustomizeDashboardItemCaption

            ' Load the dashboard after all DashboardViewer options are set.
            dashboardViewer1.DashboardSource = GetType(Dashboard1)
        End Sub
        Private Sub DashboardViewer1_CustomizeDashboardItemCaption(ByVal sender As Object, ByVal e As CustomizeDashboardItemCaptionEventArgs)
            Dim viewer As DashboardViewer = DirectCast(sender, DashboardViewer)
            If e.DashboardItemName = "pieDashboardItem1" Then
                Dim infoButton As New DashboardToolbarItem()
                Dim mData As MultiDimensionalData = viewer.GetItemData(e.DashboardItemName)
                Dim orderCount = If(mData.GetValue(mData.GetMeasures().Where(Function(m) m.DataMember = "OrderID").First()).Value, 0)
                e.FilterText &= String.Format("{0:N0} distinct orders are displayed", orderCount)
            End If
        End Sub

        Private Sub DashboardViewer1_ConfigureDataConnection(ByVal sender As Object, ByVal e As DashboardConfigureDataConnectionEventArgs)
            Dim parameters As ExtractDataSourceConnectionParameters = TryCast(e.ConnectionParameters, ExtractDataSourceConnectionParameters)
            If parameters IsNot Nothing Then
                parameters.FileName = Path.GetFileName(parameters.FileName)
            End If
        End Sub

    End Class
End Namespace

using DevExpress.DashboardCommon.ViewerData;
using DevExpress.DashboardWin;
using DevExpress.XtraCharts;

namespace TotalsInChartsExample
{
    public partial class Form1 : DevExpress.XtraEditors.XtraForm
    {
        public Form1() {
            InitializeComponent();

            dashboardViewer1.DashboardItemControlUpdated += Viewer_DashboardItemControlUpdated;
            dashboardViewer1.CalculateHiddenTotals = true;
            dashboardViewer1.DashboardSource = typeof(Dashboards.Dashboard1);
        }

        private void Viewer_DashboardItemControlUpdated(object sender, DashboardItemControlEventArgs e) {
            if (e.DashboardItemName == "pieDashboardItem1") {
                var viewer = (DashboardViewer)sender;
                var chart = e.ChartControl;

                var data = viewer.GetItemData(e.DashboardItemName);
                var measure = data.GetMeasures()[0];

                foreach (Series series in chart.Series) {
                    var axisPoint = series.Tag as AxisPoint;
                    if (axisPoint != null) {
                        var total = data.GetSlice(axisPoint).GetValue(measure).DisplayText;
                        var view = series.View as PieSeriesView;
                        if (view != null)
                            view.Titles[0].Text = string.Format("{0} - {1}", series.Name, total);
                    }
                }
            }
        }
    }
}

Imports DevExpress.DashboardCommon.ViewerData
Imports DevExpress.DashboardWin
Imports DevExpress.XtraCharts

Namespace TotalsInChartsExample
    Partial Public Class Form1
        Inherits DevExpress.XtraEditors.XtraForm

        Public Sub New()
            InitializeComponent()

            AddHandler dashboardViewer1.DashboardItemControlUpdated, AddressOf Viewer_DashboardItemControlUpdated
            dashboardViewer1.CalculateHiddenTotals = True
            dashboardViewer1.DashboardSource = GetType(Dashboards.Dashboard1)
        End Sub

        Private Sub Viewer_DashboardItemControlUpdated(ByVal sender As Object, ByVal e As DashboardItemControlEventArgs)
            If e.DashboardItemName = "pieDashboardItem1" Then
                Dim viewer = DirectCast(sender, DashboardViewer)
                Dim chart = e.ChartControl

                Dim data = viewer.GetItemData(e.DashboardItemName)
                Dim measure = data.GetMeasures()(0)

                For Each series As Series In chart.Series
                    Dim axisPoint = TryCast(series.Tag, AxisPoint)
                    If axisPoint IsNot Nothing Then
                        Dim total = data.GetSlice(axisPoint).GetValue(measure).DisplayText
                        Dim view = TryCast(series.View, PieSeriesView)
                        If view IsNot Nothing Then
                            view.Titles(0).Text = String.Format("{0} - {1}", series.Name, total)
                        End If
                    End If
                Next series
            End If
        End Sub
    End Class
End Namespace

dashboardViewer1.DashboardItemControlUpdated += Viewer_DashboardItemControlUpdated;
dashboardViewer1.CalculateHiddenTotals = true;
dashboardViewer1.DashboardSource = typeof(Dashboards.Dashboard1);

AddHandler dashboardViewer1.DashboardItemControlUpdated, AddressOf Viewer_DashboardItemControlUpdated
dashboardViewer1.CalculateHiddenTotals = True
dashboardViewer1.DashboardSource = GetType(Dashboards.Dashboard1)