[NonCategorized]
public DataTemplate ToolTipContentTemplate { get; set; }

<NonCategorized>
Public Property ToolTipContentTemplate As DataTemplate

<dx:ThemedWindow xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core" 
                 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
                 xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map" 
                 xmlns:dxmt="http://schemas.devexpress.com/winfx/2008/xaml/map/themekeys" 
                 xmlns:dxi="http://schemas.devexpress.com/winfx/2008/xaml/core/internal" 
                 xmlns:local="clr-namespace:ToolTipSample"
                 x:Class="ToolTipSample.MainWindow" 
                 Title="MainWindow" 
                 Height="720" 
                 Width="1280">
    <dx:ThemedWindow.Resources>
        <local:ToolTipInfoToMapPieConverter x:Key="tooltipInfoToMapPieConverter" />
        <DataTemplate x:Key="tooltipSegmentTemplate">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition SharedSizeGroup="SegmentIdSizeGroup" />
                    <ColumnDefinition SharedSizeGroup="SegmentValueSizeGroup" />
                </Grid.ColumnDefinitions>
                <TextBlock Text="{Binding SegmentId}"
                           Margin="0,0,16,0"
                           FontSize="16" 
                           Foreground="{dxi:ThemeResource {dxmt:MapBrushesThemeKey ResourceKey=ToolTipForeground}}" />
                <TextBlock Grid.Column="1"
                           Text="{Binding Value}" 
                           TextAlignment="Right"
                           FontSize="16" 
                           Foreground="{dxi:ThemeResource {dxmt:MapBrushesThemeKey ResourceKey=ToolTipForeground}}" />
            </Grid>
        </DataTemplate>
        <DataTemplate x:Key="tooltipContentTemplate">
            <StackPanel Orientation="Vertical" 
                        DataContext="{Binding Converter={StaticResource tooltipInfoToMapPieConverter}}"
                        Margin="16">
                <TextBlock Text="{Binding ItemId}" 
                           FontSize="24" 
                           Foreground="{dxi:ThemeResource {dxmt:MapBrushesThemeKey ResourceKey=ToolTipForeground}}" />
                <ItemsControl ItemsSource="{Binding Segments}" 
                              ItemTemplate="{StaticResource tooltipSegmentTemplate}"/>
            </StackPanel>
        </DataTemplate>
    </dx:ThemedWindow.Resources>
    <Grid>
        <dxm:MapControl x:Name="mapControl" ToolTipEnabled="True">
            <dxm:MapControl.Layers>
                <dxm:ImageLayer>
                    <dxm:ImageLayer.DataProvider>
                        <dxm:BingMapDataProvider BingKey="YOUR_BING_KEY"
                                                 Kind="Road"/>
                    </dxm:ImageLayer.DataProvider>
                </dxm:ImageLayer>
                <dxm:VectorLayer x:Name="pieLayer" 
                                 DataLoaded="OnPieLayerDataLoaded" 
                                 ToolTipContentTemplate="{StaticResource tooltipContentTemplate}">
                    <dxm:VectorLayer.Colorizer>
                        <dxm:KeyColorColorizer>
                            <dxm:KeyColorColorizer.ItemKeyProvider>
                                <dxm:IdItemKeyProvider />
                            </dxm:KeyColorColorizer.ItemKeyProvider>
                        </dxm:KeyColorColorizer>
                    </dxm:VectorLayer.Colorizer>
                    <dxm:VectorLayer.Data>
                        <dxm:PieChartDataAdapter DataSource="{Binding EnergyStatisticsItems}" 
                                                 ItemIdDataMember="Country" 
                                                 ItemMinSize="25"
                                                 ItemMaxSize="100">
                            <dxm:PieChartDataAdapter.Mappings>
                                <dxm:MapPieMappingInfo Latitude="Latitude" 
                                                       Longitude="Longitude" 
                                                       SegmentId="EnergyType" 
                                                       SegmentValue="Production" />
                            </dxm:PieChartDataAdapter.Mappings>
                        </dxm:PieChartDataAdapter>
                    </dxm:VectorLayer.Data>
                </dxm:VectorLayer>
            </dxm:MapControl.Layers>
            <dxm:MapControl.Legends>
                <dxm:ColorListLegend Layer="{Binding ElementName=pieLayer}" />
            </dxm:MapControl.Legends>
        </dxm:MapControl>
    </Grid>
</dx:ThemedWindow>

using System;
using System.Globalization;
using System.Windows.Data;
using DevExpress.Xpf.Map;

namespace ToolTipSample {
    public partial class MainWindow : DevExpress.Xpf.Core.ThemedWindow {
        public MainWindow() {
            InitializeComponent();
        }

        private void OnPieLayerDataLoaded(object sender, DataLoadedEventArgs e) {
            mapControl.ZoomToFitLayerItems();
        }
    }

    class ToolTipInfoToMapPieConverter : IValueConverter {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture) {
            if (!(value is ToolTipInfo info)) return null;
            if (!(info.Layer is VectorLayer vectorLayer)) return null;
            return vectorLayer.Data.GetItemBySourceObject(info.Item) as MapPie;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {
            throw new NotSupportedException();
        }
    }
}

Imports System.Globalization
Imports DevExpress.Xpf.Map

Class MainWindow
    Private Sub OnPieLayerDataLoaded(sender As Object, e As DataLoadedEventArgs)
        mapControl.ZoomToFitLayerItems()
    End Sub
End Class

Class ToolTipInfoToMapPieConverter
    Implements IValueConverter

    Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert
        Dim info = TryCast(value, ToolTipInfo)
        If ((info Is Nothing)) Then Return Nothing
        Dim vectorLayer = TryCast(info.Layer, VectorLayer)
        If (vectorLayer Is Nothing) Then Return Nothing
        Return TryCast(vectorLayer.Data.GetItemBySourceObject(info.Item), MapPie)
    End Function

    Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
        Throw New NotSupportedException()
    End Function
End Class