MainWindow.xaml

<Window x:Class="ToolTipPointTemplate.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts"
        Title="MainWindow" Height="500" Width="800" >
    <Grid>
        <dxc:ChartControl Name="chart" Width="758" Height="440"  
                          ToolTipEnabled="True" CrosshairEnabled="False">
            <dxc:ChartControl.ToolTipController>
                <dxc:ChartToolTipController ToolTipOpening="ChartToolTipController_ToolTipOpening" />
            </dxc:ChartControl.ToolTipController>
            <dxc:XYDiagram2D>
                <dxc:BarSideBySideSeries2D ColorEach="True" DisplayName="G8 GDP in 2010"
                                           ArgumentDataMember="CountryName"
                                           ValueDataMember="GDPin2010"                                              
                                           ValueScaleType="Numerical"
                                           ToolTipHintDataMember="ToolTipData">

                    <dxc:BarSideBySideSeries2D.ToolTipPointTemplate>
                        <DataTemplate>
                            <dxc:ChartControl Width="300" Height="150" EnableAnimation="True" 
                                              DataSource="{Binding Hint.GDPs}">
                                <dxc:XYDiagram2D>
                                    <dxc:LineSeries2D ArgumentDataMember="Year"
                                                      ValueDataMember="Product"
                                                      ArgumentScaleType="Numerical"
                                                      ValueScaleType="Numerical"
                                                      Brush="{Binding Hint.SeriesBrush}"
                                                      MarkerSize="5">
                                    </dxc:LineSeries2D>
                                    <dxc:XYDiagram2D.AxisX>
                                        <dxc:AxisX2D>
                                            <dxc:AxisX2D.Range>
                                                <dxc:AxisRange MinValue="2000" MaxValue="2011"/>
                                            </dxc:AxisX2D.Range>
                                        </dxc:AxisX2D>
                                    </dxc:XYDiagram2D.AxisX>
                                    <dxc:XYDiagram2D.AxisY>
                                        <dxc:AxisY2D MinorCount="1">
                                            <dxc:AxisY2D.Range >
                                                <dxc:AxisRange />
                                            </dxc:AxisY2D.Range>
                                        </dxc:AxisY2D>
                                    </dxc:XYDiagram2D.AxisY>
                                </dxc:XYDiagram2D>
                                <dxc:ChartControl.Titles>
                                    <dxc:Title Margin="0" Padding="0" Dock="Top" FontSize="14"
                                               HorizontalAlignment="Center" VerticalAlignment="Top" 
                                               Content="{Binding Hint.Title}" />
                                </dxc:ChartControl.Titles>
                            </dxc:ChartControl>
                        </DataTemplate>
                    </dxc:BarSideBySideSeries2D.ToolTipPointTemplate>
                </dxc:BarSideBySideSeries2D>
            </dxc:XYDiagram2D>
        </dxc:ChartControl>
    </Grid>
</Window>