<UserControl x:Class="SilverlightTest1.MyView"
    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="300" d:DesignWidth="400">
    
    <Grid x:Name="LayoutRoot" Background="White" DataContext="1234">
        <ComboBox x:Name="cmbCurrency"           
                  ItemsSource="{Binding IsoCurrenciesList}"          
                  DisplayMemberPath="Description"          
                  SelectedValuePath="LocaleID"          
                  SelectedValue="{Binding CurrencyId, Mode=TwoWay}"></ComboBox>
    </Grid>
</UserControl>