[Bindable(true)]
public object ItemsSource { get; set; }

<Bindable(True)>
Public Property ItemsSource As Object

<dxlc:LayoutItem Label="User">
    <dxe:ComboBoxEdit EditValue="{Binding Item.UserId}" ItemsSource="{Binding EditOperationContext.Users}"
                      ValueMember="Id" DisplayMember="Name"

<dxe:ComboBoxEdit DisplayMember="Color"
                  ItemsSource="{Binding View.DataContext.ComboBoxItems}"
                  FilterCriteria="{Binding RowData.Row.FilterType, Converter={local:FilterConverter}}"

EditValue="{Binding Path=Address.State, Mode=TwoWay}"
ItemsSource="{dxe:EnumItemsSource EnumType={x:Type local:StateEnum},
                                  AllowImages=False}"

<dxe:ComboBoxEdit VerticalAlignment="Center" Width="200" ItemsSource="{Binding Source={x:Static dx:Theme.Themes}}" x:Name="cbTheme"
                  DisplayMember="Name" ValueMember="Name" EditValueChanged="cbTheme_EditValueChanged" />

EditValue="{DXBinding '@e(scheduler).AppointmentDragMode', UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
                      ItemsSource="{dxe:EnumItemsSource EnumType=dxsch:AppointmentDragResizeMode}" />
</dxlc:LayoutItem>

InitializeComponent();
lookUpEdit.ItemsSource = new List<Item> {
    new Item { ID = 012, ShortName = "UP", LongName = "United Package"},

});
    e.ComboBoxEdit.ItemsSource = filterItems;
}

int countryId = (int)view.Grid.GetCellValue(e.RowHandle, "CountryId");
    editor.ItemsSource = Cities.Where(city => city.CountryId == countryId).ToList();
}

string[] array = Enum.GetNames(typeof(EncryptionType));
encryptionComboBoxEdit.ItemsSource = array;
encryptionComboBoxEdit.SelectedItem = EncryptionType.Strong.ToString();

filterItems.Add(New CustomComboBoxItem() With {.DisplayValue = "Registered in 2009", .EditValue = CriteriaOperator.Parse(String.Format("[RegistrationDate] >= #{0}# AND [RegistrationDate] < #{1}#", New DateTime(2009, 1, 1), New DateTime(2010, 1, 1)))})
    e.ComboBoxEdit.ItemsSource = filterItems
End Sub

Dim countryId As Integer = CInt(view.Grid.GetCellValue(e.RowHandle, "CountryId"))
    editor.ItemsSource = Cities.Where(Function(city) city.CountryId = countryId).ToList()
End Sub