New Post: CheckComboBox with MVVM

Maybe the following link could help you ;
http://stackoverflow.com/questions/1861475/marshal-struct-problem-with-c-sharp

I made a simple sample to test the "Clear" of the CheckComboBox.ItemsSource. Everything worked well. Here's the sample :

XAML :
<Window x:Class="TestToolkit.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"
    xmlns:local="clr-namespace:TestToolkit"
    x:Name="_demo"
    Title="MainWindow" Height="800" Width="1200" >

<Grid>

<xctk:CheckComboBox ItemsSource="{Binding PersonList, ElementName=_demo }" DisplayMemberPath="Name"/>

</Grid>
</Window>

C# :
public class Person : DependencyObject
{

public string Name
{
  get;
  set;
}

public int ID
{
  get;
  set;
}

}

public partial class MainWindow : Window
{

ObservableCollection<Person> _personList = new ObservableCollection<Person>();

public ObservableCollection<Person> PersonList
{
  get
  {
    return _personList;
  }
}

public MainWindow()
{
  _personList.Add( new Person() { Name="Bob", ID=1});
  _personList.Add( new Person() { Name="Tom", ID=2});
  _personList.Add( new Person() { Name="Mark", ID=3});
  _personList.Add( new Person() { Name="Brian", ID=4});
  _personList.Add( new Person() { Name="Carey", ID=5});
  _personList.Add( new Person() { Name="Scott", ID=6});

  InitializeComponent();
}

protected override void OnKeyDown( KeyEventArgs e )

{
  base.OnKeyDown( e );

  if( e.Key == Key.A )
  {
    PersonList.Clear();
    PersonList.Add( new Person() { Name="Alan", ID=5});
    PersonList.Add( new Person() { Name="Kevin", ID=6});
    e.Handled = true;
  }
}

So when the Key_A is pressed, the list used for the binding of the CheckComboBox is cleared and new entries are made. CheckComboBox has been updated without errors.