<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="WpfApplication1.Window1" Title="FlowDirection Sample"> <DockPanel HorizontalAlignment="Left" VerticalAlignment="Top"> <StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="0,0,0,10"> <Button Click="LR">LeftToRight</Button> <Button Click="RL">RightToLeft</Button> </StackPanel> <TextBlock Name="txt1" DockPanel.Dock="Bottom" Margin="0,50,0,0"/> <FlowDocumentReader> <FlowDocument FontFamily="Arial" Name="tf1" > <Paragraph>this is a test</Paragraph> <Paragraph>this is a test</Paragraph> </FlowDocument> </FlowDocumentReader> </DockPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; namespace WpfApplication1 { public partial class Window1 : Window { public void LR(object sender, RoutedEventArgs e) { tf1.FlowDirection = FlowDirection.LeftToRight; txt1.Text = "FlowDirection is now " + tf1.FlowDirection.ToString(); } public void RL(object sender, RoutedEventArgs e) { tf1.FlowDirection = FlowDirection.RightToLeft; txt1.Text = "FlowDirection is now " + tf1.FlowDirection.ToString(); } } }