<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="SDKSample.FigureLengthExample" >

  <FlowDocumentReader>
    <FlowDocument >
      <Paragraph>
        Raw text inside the paragraph
        <Figure Name="myFigure" Width="300">
          <Paragraph FontStyle="Italic" MouseDown="OnMouseDownDecreaseWidth" >
            Text inside of paragraph that is inside Figure...
          </Paragraph>
        </Figure>
      </Paragraph>
    </FlowDocument>
  </FlowDocumentReader>



</Page>

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace SDKSample
{
    public partial class FigureLengthExample : Page
    {

        void OnMouseDownDecreaseWidth(object sender, MouseButtonEventArgs args)
        {
            FigureLength myFigureLength = myFigure.Width;
            double widthValue = myFigureLength.Value;
            if (widthValue > 0)
            {
                myFigure.Width = new FigureLength((widthValue - 10), FigureUnitType.Pixel);
            }
        }
    }
}