silverlight - How to data bind a ComboBox with a Dictionary

how to data bind ComboBox with Dictionary data source in silverlight
MainPage.xaml

<UserControl 
    x:Class="SilverlightApps.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="600" 
    d:DesignWidth="800" 
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
    >

    <Grid x:Name="LayoutRoot" Background="White">
        <Rectangle
            Name="Rectangle1"
            Fill="AliceBlue" 
            HorizontalAlignment="Left" 
            Height="82" 
            Margin="20,12,0,0" 
            Stroke="Black" 
            VerticalAlignment="Top" 
            Width="600"
            StrokeThickness="0"
            />

        <TextBlock 
            Name="TextBlock1" 
            Height="82" 
            HorizontalAlignment="Left" 
            Margin="20,9,0,0" 
            Text="how to data bind ComboBox with Dictionary data source in silverlight"
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="20"
            FontStyle="Italic"
            Foreground="MidnightBlue"
            Width="600"
            Padding="25,10,10,0"
            />

        <ComboBox 
            Name="ComboBox1"
            HorizontalAlignment="Left"
            Height="35"
            Width="300"
            Margin="20,108,0,457"
            >
            <ComboBox.ItemTemplate>
                <DataTemplate>
                        <StackPanel Orientation="Horizontal" Margin="1" Background="Snow">
                            <TextBlock
                                Text="{Binding Key}" 
                                Foreground="Crimson"
                                FontFamily="Georgia"
                                FontWeight="Bold"
                                FontSize="14"
                                TextWrapping="Wrap"
                                Width="25"
                                Margin="5"
                                />
                            <TextBlock 
                                Text="{Binding Value}" 
                                Foreground="DimGray"
                                FontFamily="Comic Sans MS"
                                FontStyle="Italic"
                                TextWrapping="Wrap"
                                Width="250"
                                FontSize="15"
                                Margin="5"
                                />
                        </StackPanel>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </Grid>
</UserControl>
MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApps
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            Dictionary<int, String> colors = new Dictionary<int, String>();
            colors.Add(1, "Aqua");
            colors.Add(2, "Beige");
            colors.Add(3, "BlueViolet");
            colors.Add(4, "CadetBlue");
            colors.Add(5, "CornflowerBlue");

            ComboBox1.ItemsSource = colors;
        }
    }
}
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