New Post: CheckComboBox selectedItems

Hi,

For the command property not being called the first time when "SelectedItemsOverride" is assigned to a new "ObservableCollection", how exactly do you reproduce this ? Here's my sample that looks good :

<StackPanel>
      <xctk:CheckComboBox x:Name="UserGroupsCheckedComboBox"
                          ItemsSource="{Binding UserGroups}"
                          SelectedItemsOverride="{Binding SelectedUserGroups}"
                          DisplayMemberPath="Name"
                          Command="{Binding OnUserGroupTypeToggledCommand}"
                          ValueMemberPath="ID" />

      <StackPanel Margin="0,200,0,0"
                  Orientation="Horizontal">
        <TextBlock Text="SelectedItems : " />
        <TextBlock Text="{Binding SelectedItemsOverride.Count, ElementName=UserGroupsCheckedComboBox}" />
      </StackPanel>
</StackPanel>

  public partial class MainWindow : Window
  {
    public MainWindow()
    {
      InitializeComponent();

      this.UserGroups = new ObservableCollection<MyData>()
      {
        new MyData() { ID = 1, Name = "First" },
        new MyData() { ID = 2, Name = "Second" },
        new MyData() { ID = 3, Name = "Third" },
        new MyData() { ID = 4, Name = "Fourth" },
        new MyData() { ID = 5, Name = "Fifth" },
      };
      this.SelectedUserGroups = new ObservableCollection<MyData>() { this.UserGroups[ 2 ] };
      this.DataContext = this;

      this.OnUserGroupTypeToggledCommand = new RelayCommand( param => SaveExecute(), param => CanExecuteMyCommand() );
    }

    public ICommand OnUserGroupTypeToggledCommand
    {
      get;
      set;
    }

    public ObservableCollection<MyData> UserGroups
    {
      get;
      set;
    }

    public ObservableCollection<MyData> SelectedUserGroups
    {
      get;
      set;
    }

    private bool CanExecuteMyCommand()
    {
      return true;
    }

    public void SaveExecute()
    {
      System.Diagnostics.Debug.WriteLine("Saving !!");
    }
  }

  public class MyData
  {
    public string Name
    {
      get;
      set;
    }

    public int ID
    {
      get;
      set;
    }
  }


  public class RelayCommand : ICommand
  {
    #region Fields 
    readonly Action<object> _execute;
    readonly Predicate<object> _canExecute;
    #endregion // Fields 
    #region Constructors 
    public RelayCommand( Action<object> execute ) : this( execute, null ) { }
    public RelayCommand( Action<object> execute, Predicate<object> canExecute )
    {
      if( execute == null )
        throw new ArgumentNullException( "execute" );
      _execute = execute;
      _canExecute = canExecute;
    }
    #endregion // Constructors 
    #region ICommand Members 
    [DebuggerStepThrough]
    public bool CanExecute( object parameter )
    {
      return _canExecute == null ? true : _canExecute( parameter );
    }
    public event EventHandler CanExecuteChanged
    {
      add
      {
        CommandManager.RequerySuggested += value;
      }
      remove
      {
        CommandManager.RequerySuggested -= value;
      }
    }
    public void Execute( object parameter )
    {
      _execute( parameter );
    }
    #endregion // ICommand Members 
  }

――――
Get more controls, features, updates and technical support with Xceed Toolkit Plus for WPF