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  4. Programmatically change the FlowDirection of content within a FlowDocumentReader element
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="WpfApplication1.Window1" Title="FlowDirection Sample">
    
      
        LeftToRight
        RightToLeft
      
      
      
        
          this is a test
      
      
    

//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();
        }
    }
}