public string LabelDataMember { get; set; }

Public Property LabelDataMember As String

<dxtm:SunburstControl>
  <dxtm:SunburstControl.DataAdapter>
      <dxtm:SunburstHierarchicalDataAdapter
              x:Name="dataAdapter"
              DataSource="{Binding}">
          <dxtm:SunburstHierarchicalDataAdapter.Mappings>
              <dxtm:SunburstDataMapping                             
                      LabelDataMember="CountryName"
                      ChildrenDataMember="CityInfos"
                      Type="{x:Type local:CountryInfo}"/>
              <dxtm:SunburstDataMapping                               
                      LabelDataMember="CityName"
                      ChildrenDataMember="SaleInfos"
                      Type="{x:Type local:CityInfo}"/>
              <dxtm:SunburstDataMapping
                      ValueDataMember="Total"
                      LabelDataMember="Category"                             
                      Type="{x:Type local:ProductInfo}"/>
          </dxtm:SunburstHierarchicalDataAdapter.Mappings>
      </dxtm:SunburstHierarchicalDataAdapter>
  </dxtm:SunburstControl.DataAdapter>
</dxtm:SunburstControl>

using System.Collections.Generic;
using System.Windows;

namespace HierarchicalSunburst {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            DataContext = CreateInfos();
        }
        List<CountryInfo> CreateInfos() {
            List<CountryInfo> infos = new List<CountryInfo>();
            CountryInfo germanyInfo = new CountryInfo { CountryName = "Germany" };
            CityInfo leipzigInfo = new CityInfo { CityName = "Leipzig" };
            leipzigInfo.SaleInfos.AddRange(new List<ProductInfo> {
                new ProductInfo { Category = "Beverages", Total = 2634.5 },
                new ProductInfo { Category = "Baked Goods", Total = 4523.98 },
                new ProductInfo { Category = "Grains and Cereals", Total = 913.85 },
                new ProductInfo { Category = "Milk and Dairy", Total = 4219.98 },
            });
            CityInfo berlinInfo = new CityInfo { CityName = "Berlin" };
            berlinInfo.SaleInfos.AddRange(new List<ProductInfo> {
                new ProductInfo { Category = "Frozen Foods", Total = 900 }
            });
            germanyInfo.CityInfos.AddRange(new List<CityInfo> { leipzigInfo, berlinInfo });

            CountryInfo spainInfo = new CountryInfo { CountryName = "Spain" };
            CityInfo barcelonaInfo = new CityInfo { CityName = "Barcelona" };
            barcelonaInfo.SaleInfos.AddRange(new List<ProductInfo> {
                new ProductInfo { Category = "Baked Goods", Total = 1239.2 },
                new ProductInfo { Category = "Fruits", Total = 450.41 },
                new ProductInfo { Category = "Milk and Dairy", Total = 692.5 },
            });
            CityInfo madridInfo = new CityInfo { CityName = "Madrid" };
            madridInfo.SaleInfos.AddRange(new List<ProductInfo> {
                new ProductInfo { Category = "Spices", Total = 1010.30 },
                new ProductInfo { Category = "Vegetables", Total = 2078 }
            });
            spainInfo.CityInfos.AddRange(new List<CityInfo> { barcelonaInfo, madridInfo });

            infos.AddRange(new List<CountryInfo> { germanyInfo, spainInfo });

            return infos;
        }
    }
    public class CountryInfo {
        public string CountryName { get; set; }
        public List<CityInfo> CityInfos { get; set; } = new List<CityInfo>();
    }
    public class CityInfo {
        public string CityName { get; set; }
        public List<ProductInfo> SaleInfos { get; set; } = new List<ProductInfo>();
    }
    public class ProductInfo {
        public string Category { get; set; }
        public double Total { get; set; }
    }
}

Imports System.Collections.Generic

Namespace HierarchicalSunburst
    Public Partial Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()
            DataContext = CreateInfos()
        End Sub

        Private Function CreateInfos() As List(Of CountryInfo)
            Dim infos As List(Of CountryInfo) = New List(Of CountryInfo)()
            Dim germanyInfo As CountryInfo = New CountryInfo With {
                .CountryName = "Germany"
            }
            Dim leipzigInfo As CityInfo = New CityInfo With {
                .CityName = "Leipzig"
            }
            leipzigInfo.SaleInfos.AddRange(New List(Of ProductInfo) From {
                New ProductInfo With {
                    .Category = "Beverages",
                    .Total = 2634.5
                },
                New ProductInfo With {
                    .Category = "Baked Goods",
                    .Total = 4523.98
                },
                New ProductInfo With {
                    .Category = "Grains and Cereals",
                    .Total = 913.85
                },
                New ProductInfo With {
                    .Category = "Milk and Dairy",
                    .Total = 4219.98
                }
            })
            Dim berlinInfo As CityInfo = New CityInfo With {
                .CityName = "Berlin"
            }
            berlinInfo.SaleInfos.AddRange(New List(Of ProductInfo) From {
                New ProductInfo With {
                    .Category = "Frozen Foods",
                    .Total = 900
                }
            })
            germanyInfo.CityInfos.AddRange(New List(Of CityInfo) From {
                leipzigInfo,
                berlinInfo
            })
            Dim spainInfo As CountryInfo = New CountryInfo With {
                .CountryName = "Spain"
            }
            Dim barcelonaInfo As CityInfo = New CityInfo With {
                .CityName = "Barcelona"
            }
            barcelonaInfo.SaleInfos.AddRange(New List(Of ProductInfo) From {
                New ProductInfo With {
                    .Category = "Baked Goods",
                    .Total = 1239.2
                },
                New ProductInfo With {
                    .Category = "Fruits",
                    .Total = 450.41
                },
                New ProductInfo With {
                    .Category = "Milk and Dairy",
                    .Total = 692.5
                }
            })
            Dim madridInfo As CityInfo = New CityInfo With {
                .CityName = "Madrid"
            }
            madridInfo.SaleInfos.AddRange(New List(Of ProductInfo) From {
                New ProductInfo With {
                    .Category = "Spices",
                    .Total = 1010.30
                },
                New ProductInfo With {
                    .Category = "Vegetables",
                    .Total = 2078
                }
            })
            spainInfo.CityInfos.AddRange(New List(Of CityInfo) From {
                barcelonaInfo,
                madridInfo
            })
            infos.AddRange(New List(Of CountryInfo) From {
                germanyInfo,
                spainInfo
            })
            Return infos
        End Function
    End Class

    Public Class CountryInfo
        Public Property CountryName As String
        Public Property CityInfos As List(Of CityInfo) = New List(Of CityInfo)()
    End Class

    Public Class CityInfo
        Public Property CityName As String
        Public Property SaleInfos As List(Of ProductInfo) = New List(Of ProductInfo)()
    End Class

    Public Class ProductInfo
        Public Property Category As String
        Public Property Total As Double
    End Class
End Namespace