WPF-Add SpellCheck feature.

<Window x:Class="WpfSpellCheckApplication.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Title="Spell Check" Height="350" Width="525">
    <Grid>
        <TextBox HorizontalAlignment="Left" Margin="12,12,0,0" Name="txtSpellCheker" VerticalAlignment="Top" Width="120" Height="25" SpellCheck.IsEnabled="True" />
    </Grid>
</Window>