WPF

<cbe:ComboBoxEdit Height="32"
                    Width="350"
                    ItemsSource="{Binding Items}"
                    SelectedItem="{Binding SelectedItem}"
                    PopupFooterButtons="OkCancel"
                    VerticalAlignment="Top"
                    Margin="5,20,0,0">

<pre>
<ComboBox.ItemTemplate>

    <DataTemplate>
        <StackPanel Orientation="Horizontal">
            <CheckBox IsChecked="{Binding IsItemChecked}"
                        Margin="2"/>
            <TextBlock Text="{Binding Caption}"
                        Margin="2"/>
        </StackPanel>
    </DataTemplate>

</ComboBox.ItemTemplate>

public MainWindow()
{
    InitializeComponent();
    this.DataContext = this;
    Items = new ObservableCollection<Item>
    {
        new Item
        {
            Caption = "Awarded",
            IsItemChecked = false
        },
        new Item
        {
            Caption = "Bidding",
            IsItemChecked = true
        },
        new Item
        {
            Caption = "Cancelled",
            IsItemChecked = false
        },
        new Item
        {
            Caption = "Completed",
            IsItemChecked = false
        },
        new Item
        {
            Caption = "In Progress",
            IsItemChecked = true
        },
        new Item
        {
            Caption = "On Hold",
            IsItemChecked = false
        }
    };
}

<pre><ComboBox.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Vertical">

<pre>
        <StackPanel Orientation="Horizontal">
            <CheckBox IsChecked="{Binding IsSelected}"
                    Margin="5" />
            <TextBlock Text="{Binding Caption}"
                    Margin="5" />
        </StackPanel>

    </StackPanel>
</DataTemplate>

<Border Grid.Row="0" Margin="5" BorderThickness="1" BorderBrush="Black" x:Name="container">
    <Canvas x:Name="cnvMainView" Background="White" Height="{Binding Path=ActualHeight,
                                   ElementName=container}" Width="{Binding Path=ActualWidth, ElementName=container}">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseDown" >
                <i:InvokeCommandAction Command="{Binding MouseDown}" />
            </i:EventTrigger>
        </i:Interaction.Triggers>
    </Canvas>
</Border>

class MainViewModel
    {
        public MainViewModel()
        {
            this.MouseDown = new DelegateCommand<object>(
                                             this.OnMouseDown, this.CanMouseDown);
        }

        public ICommand MouseDown { get; private set; }

        private void OnMouseDown(object arg)
        {
        //Do Something
        }
        private bool CanMouseDown(object arg) { return true; }
    }

var MouseDownPosition = from evt in Observable.FromEventPattern<MouseEventHandler,MouseEventArgs>(
                             h => cnvMainView.MouseDown += h,
                             h => cnvMainView.MouseDown -= h)
                             select evt.EventArgs.GetPosition(cnvMainView);

public class NavigationItem : BindableBase // Implements INPC
{
    public int ItemId { get; set; }
    public string Caption { get; set; }
    public NavigationItemType ItemType { get; set; }
    public ObservableCollection<NavigationItem> NavigationItems { get; set; }
}

<pre><ListBox Grid.Row="1" 
            Grid.Column="0"
            ItemsSource="{Binding NavigationBarItems}">

<pre>
<ListBox.ItemTemplate>
    <DataTemplate>
        <Expander Header="{Binding Caption}">
            <ListBox ItemsSource="{Binding NavigationItems}">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Caption}"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Expander>
    </DataTemplate>
</ListBox.ItemTemplate>