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        public List<Project> Projects { get; set; }
        public List<Project> SelectedProjects 
        {
            get => OnGetProperty<List<Project>>();
            set => OnSetProperty(value);
        }

public ViewModel(IList<Project> projects)
        {
            Projects = projects.ToList<Project>();
            SelectedProjects = new List<Project>();
        }

  protected override bool OnLoad()
        {
            Header = Resources.Strings.Common.Projects;
            OkCommand = new Command(OpenProject);

            return true;
        }

        private void OpenProject()
        {
            DialogResult = DialogResult.OK;
            Invoke(CloseAction);
        }                    

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    <dxe:ListBoxEdit ItemsSource="{Binding Path=Projects}"
                         EditValue="{Binding SelectedProjects, Mode=TwoWay}"
                         SelectionMode="Multiple"
                         HorizontalAlignment="Stretch"
                         VerticalAlignment="Stretch"
                         Width="600"
                         Height="400"
                         ScrollViewer.VerticalScrollBarVisibility="Visible">
            <dxe:ListBoxEdit.ItemTemplate>
                <DataTemplate DataType="models:Project">
                    <StackPanel Orientation="Horizontal">
                        <Label Content="{Binding Path=Name}" />                    
                    </StackPanel>
                </DataTemplate>
            </dxe:ListBoxEdit.ItemTemplate>
        </dxe:ListBoxEdit>