KeyColorColorizer Class

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Xml.Linq;
using DevExpress.XtraCharts;

namespace KeyColorColorizerExample {
    public partial class Form1 : Form {
        const string filepath = "..//..//Data//GDP.xml";

        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            #region #BarSeries
            // Create and customize a bar series. 
            Series barSeries = new Series() {
                DataSource = LoadData(filepath),
                ArgumentDataMember = "Country",
                ColorDataMember = "Region",
                View = new SideBySideBarSeriesView()
            };
            barSeries.View.Colorizer = CreateColorizer();
            barSeries.ValueDataMembers.AddRange(new string[] { "Product" });
            #endregion #BarSeries

            // Add the series to the ChartControl's Series collection. 
            chartControl1.Series.Add(barSeries);

            // Show a title for the values axis. 
            ((XYDiagram)chartControl1.Diagram).AxisY.Title.Text = "GDP per capita, $";
            ((XYDiagram)chartControl1.Diagram).AxisY.Title.Visibility = DevExpress.Utils.DefaultBoolean.True;
        }

        #region #KeyColorColorier
        // Creates the Key-Color colorizer for the bar chart. 
        ChartColorizerBase CreateColorizer() {
            KeyColorColorizer colorizer = new KeyColorColorizer() {
                PaletteName = "Apex" 
            };
            colorizer.Keys.Add("Africa");
            colorizer.Keys.Add("America");
            colorizer.Keys.Add("Asia");
            colorizer.Keys.Add("Australia");
            colorizer.Keys.Add("Europe");

            return colorizer;
        }
        #endregion #KeyColorColorier

        #region #DataLoad
        class HpiPoint {
            public string Country { get; set; }
            public double Product { get; set; }
            public string Region { get; set; }
        }

        // Loads data from an XML data source. 
        static List<HpiPoint> LoadData(string filepath) {
            XDocument doc = XDocument.Load(filepath);
            List<HpiPoint> points = new List<HpiPoint>();
            foreach (XElement element in doc.Element("G20HPIs").Elements("CountryStatistics")) {
                points.Add(new HpiPoint() {
                    Country = element.Element("Country").Value,
                    Product = Convert.ToDouble(element.Element("Product").Value),
                    Region = element.Element("Region").Value
                });
            }
            return points;
        }
        #endregion #DataLoad
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<G20HPIs>
  <CountryStatistics>
    <Country>Argentina</Country>
    <Region>America</Region>
    <Product>16011.6728032264</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Australia</Country>
    <Region>Australia</Region>
    <Product>38159.6336533223</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Brazil</Country>
    <Region>America</Region>
    <Product>11210.3908053823</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Canada</Country>
    <Region>America</Region>
    <Product>39050.1673163719</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>China</Country>
    <Region>Asia</Region>
    <Product>7599</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>France</Country>
    <Region>Europe</Region>
    <Product>34123.1966249035</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Germany</Country>
    <Region>Europe</Region>
    <Product>37402.2677660974</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>India</Country>
    <Region>Asia</Region>
    <Product>3425.4489267524</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Indonesia</Country>
    <Region>Asia</Region>
    <Product>4325.2533282173</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Italy</Country>
    <Region>Europe</Region>
    <Product>31954.1751781228</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Japan</Country>
    <Region>Asia</Region>
    <Product>33732.8682226596</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Mexico</Country>
    <Region>America</Region>
    <Product>14563.884253986</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Russia</Country>
    <Region>Europe</Region>
    <Product>19891.3528339013</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Saudi Arabia</Country>
    <Region>Asia</Region>
    <Product>22713.4852913284</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>South Africa</Country>
    <Region>Africa</Region>
    <Product>10565.1840563081</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>South Korea</Country>
    <Region>Asia</Region>
    <Product>29101.0711400706</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Turkey</Country>
    <Region>Africa</Region>
    <Product>15686.860167575</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>United Kingdom</Country>
    <Region>Europe</Region>
    <Product>35686.1997705521</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Spain</Country>
    <Region>Europe</Region>
    <Product>32230.3585974199</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>USA</Country>
    <Region>America</Region>
    <Product>47153.0094273427</Product>
  </CountryStatistics>
</G20HPIs>

Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports System.Xml.Linq
Imports DevExpress.XtraCharts

Namespace KeyColorColorizerExample
    Partial Public Class Form1
        Inherits Form

        Private Const filepath As String = "..//..//Data//GDP.xml" 

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
'           #Region "#BarSeries" 
            ' Create and customize a bar series.
            Dim barSeries As New Series() With {
                .DataSource = LoadData(filepath),
                .ArgumentDataMember = "Country",
                .ColorDataMember = "Region",
                .View = New SideBySideBarSeriesView()
            }
            barSeries.View.Colorizer = CreateColorizer()
            barSeries.ValueDataMembers.AddRange(New String() { "Product" })
'           #End Region ' #BarSeries

            ' Add the series to the ChartControl's Series collection.
            chartControl1.Series.Add(barSeries)

            ' Show a title for the values axis.
            CType(chartControl1.Diagram, XYDiagram).AxisY.Title.Text = "GDP per capita, $" 
            CType(chartControl1.Diagram, XYDiagram).AxisY.Title.Visibility = DevExpress.Utils.DefaultBoolean.True
        End Sub

        #Region "#KeyColorColorier" 
        ' Creates the Key-Color colorizer for the bar chart.
        Private Function CreateColorizer() As ChartColorizerBase
            Dim colorizer As New KeyColorColorizer() With {.PaletteName = "Apex"}
            colorizer.Keys.Add("Africa")
            colorizer.Keys.Add("America")
            colorizer.Keys.Add("Asia")
            colorizer.Keys.Add("Australia")
            colorizer.Keys.Add("Europe")

            Return colorizer
        End Function
        #End Region ' #KeyColorColorier

        #Region "#DataLoad" 
        Private Class HpiPoint
            Public Property Country() As String
            Public Property Product() As Double
            Public Property Region() As String
        End Class

        ' Loads data from an XML data source.
        Private Shared Function LoadData(ByVal filepath As String) As List(Of HpiPoint)
            Dim doc As XDocument = XDocument.Load(filepath)
            Dim points As New List(Of HpiPoint)()
            For Each element As XElement In doc.Element("G20HPIs").Elements("CountryStatistics")
                points.Add(New HpiPoint() With {
                    .Country = element.Element("Country").Value,
                    .Product = Convert.ToDouble(element.Element("Product").Value),
                    .Region = element.Element("Region").Value
                })
            Next element
            Return points
        End Function
        #End Region ' #DataLoad
    End Class
End Namespace

<?xml version="1.0" encoding="utf-8" ?>
<G20HPIs>
  <CountryStatistics>
    <Country>Argentina</Country>
    <Region>America</Region>
    <Product>16011.6728032264</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Australia</Country>
    <Region>Australia</Region>
    <Product>38159.6336533223</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Brazil</Country>
    <Region>America</Region>
    <Product>11210.3908053823</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Canada</Country>
    <Region>America</Region>
    <Product>39050.1673163719</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>China</Country>
    <Region>Asia</Region>
    <Product>7599</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>France</Country>
    <Region>Europe</Region>
    <Product>34123.1966249035</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Germany</Country>
    <Region>Europe</Region>
    <Product>37402.2677660974</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>India</Country>
    <Region>Asia</Region>
    <Product>3425.4489267524</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Indonesia</Country>
    <Region>Asia</Region>
    <Product>4325.2533282173</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Italy</Country>
    <Region>Europe</Region>
    <Product>31954.1751781228</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Japan</Country>
    <Region>Asia</Region>
    <Product>33732.8682226596</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Mexico</Country>
    <Region>America</Region>
    <Product>14563.884253986</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Russia</Country>
    <Region>Europe</Region>
    <Product>19891.3528339013</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Saudi Arabia</Country>
    <Region>Asia</Region>
    <Product>22713.4852913284</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>South Africa</Country>
    <Region>Africa</Region>
    <Product>10565.1840563081</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>South Korea</Country>
    <Region>Asia</Region>
    <Product>29101.0711400706</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Turkey</Country>
    <Region>Africa</Region>
    <Product>15686.860167575</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>United Kingdom</Country>
    <Region>Europe</Region>
    <Product>35686.1997705521</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>Spain</Country>
    <Region>Europe</Region>
    <Product>32230.3585974199</Product>
  </CountryStatistics>
  <CountryStatistics>
    <Country>USA</Country>
    <Region>America</Region>
    <Product>47153.0094273427</Product>
  </CountryStatistics>
</G20HPIs>