To get value by its key, from other dictionary through XAML - wpf

Question

I set ObservableCollection<Employe> as source for ListBox.ItemsSource, and set some DataTemplate for ListBox.ItemsSource.
XAML for template:
<DataTemplate x:Key="tmpEmploye">
<Border BorderThickness="3" BorderBrush="Gray" CornerRadius="5">
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=Surname}"
HorizontalAlignment="Stretch" Margin="2"
FontWeight="Bold" TextWrapping="Wrap"/>
<TextBlock Text="{Binding Path=Name}"
HorizontalAlignment="Stretch" Margin="2"/>
<TextBlock Text="{Binding Path=Patronymic}"
HorizontalAlignment="Stretch" Margin="2"
TextWrapping="Wrap"/>
</StackPanel>
<TextBlock Text="{Binding Path=Post}" Foreground="Gray"
HorizontalAlignment="Stretch" Margin="2"
FontStyle="Italic" TextWrapping="Wrap"/>
</StackPanel>
</Border>
</DataTemplate>
XAML for ListBox:
<ListBox x:Name="lbEmployees" x:FieldModifier="internal"
ItemTemplate="{StaticResource tmpEmploye}" HorizontalContentAlignment="Stretch"/>
Result:
Look, the Employee class has a Post property, which is an index of record from ObservableDictionary<Int64, String> (my some class). You can see the '-1' values, but I need to get value for this key from my ObservableDictionary<Int64, String> object. Can I get necessary values and to display it through XAML code?

Answer 1

You can write a IMultiValueConverter, and bind both the Post property and your dictionary to it.
See http://msdn.microsoft.com/en-us/library/system.windows.data.imultivalueconverter.aspx