<Window x:Class="WpfApplication1.Window5"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window5" Height="300" Width="300">
    <Grid>
        <TextBox Height="23" HorizontalAlignment="Left" Margin="98,103,0,0" VerticalAlignment="Top" Width="120" Text="{Binding Percent,StringFormat={}{0:0%}}"/>
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="98,180,0,0" Name="button1" VerticalAlignment="Top" Width="75" />
    </Grid>
</Window>