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>