How to use the Picker Box in Windows mobile 7 application .

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C#

C#4.0

Silverlight5

How to use the Picker Box in Windows mobile 7 application instead of a combo box.

<toolkit:PickerBox ItemsSource="{Binding SecondItems}" SelectedItem="{Binding SecondSelected}" Foreground="{StaticResource PhoneContrastForegroundBrush}">
                <toolkit:PickerBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel x:Name="stackPanel" Orientation="Horizontal" Margin="10,10" Width="440">
                            <Rectangle Fill="{Binding Brush}" Width="42" Height="42" />
                            <TextBlock Text="{Binding Name}" FontSize="36" VerticalAlignment="Center" Margin="25,0,0,0" />
                        </StackPanel>
                    </DataTemplate>
                </toolkit:PickerBox.ItemTemplate>
            </toolkit:PickerBox>

When I use toolkit:pickerbox, it shows the type toolkit:pickerbox not found, missing any assembly reference?