<Window x:Class="WpfApplication56.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <DataTemplate x:Key="ColumnTemplate">
            <Canvas Width="{Binding Path=W}" Height="{Binding Path=H}">
                <Rectangle RadiusX="25" RadiusY="25" Width="{Binding Path=W}" Height="{Binding Path=H}" Fill="{Binding Path=Interior}" />
            </Canvas>
        </DataTemplate>
    </Window.Resources>
    
    <Grid>
        <xctk:Chart>
            <xctk:Chart.Areas>
                <xctk:Area x:Name="_area1" Title="Area #1">
                    <xctk:Area.Series>
                        <xctk:Series x:Name="_series"
                                     Template="{StaticResource ColumnTemplate}"
                                     Title="Average">
                            <xctk:Series.Layout>
                                <xctk:ColumnLayout />
                            </xctk:Series.Layout>
                            <xctk:Series.DataPoints>
                                <xctk:DataPoint X="1" Y="1" Label="Oct" />
                                <xctk:DataPoint X="2" Y="2" Label="Jan"/>
                                <xctk:DataPoint X="2.5" Y="1.5" Label="Feb" />
                                <xctk:DataPoint X="4" Y="1" Label="Jun"/>
                                <xctk:DataPoint X="1.5" Y="3" Label="Dec"/>
                                <xctk:DataPoint X="5" Y="5" Label="Apr"/>
                                <xctk:DataPoint X="3" Y="1" Label="Nov"/>
                                <xctk:DataPoint X="4.5" Y="7" Label="Jul"/>
                                <xctk:DataPoint X="3.5" Y="4.5" Label="Aug"/>
                            </xctk:Series.DataPoints>
                        </xctk:Series>
                    </xctk:Area.Series>
                </xctk:Area>
            </xctk:Chart.Areas>
        </xctk:Chart>
    </Grid>
</Window>