How to: Create an Expander with a ScrollViewer

This example shows how to create an Expander control that contains complex content, such as an image and text. The example also encloses the content of the Expander in a ScrollViewer control.

The following example shows how to create an Expander. The example uses a BulletDecorator control, which contains an image and text, in order to define the Header. A ScrollViewer control provides a method for scrolling the expanded content.

Note that the example sets the Height property on the ScrollViewer instead of on the content. If the Height is set on the content, the ScrollViewer does not allow the user to scroll the content. The Width property is set on the Expander control and this setting applies to the Header and the expanded content.

<Expander Width="200" HorizontalContentAlignment="Stretch">
   <Expander.Header>
     <BulletDecorator>
       <BulletDecorator.Bullet>
         <Image Width="10" Source="images\icon.jpg"/>
       </BulletDecorator.Bullet>
       <TextBlock Margin="20,0,0,0">My Expander</TextBlock>
     </BulletDecorator>
   </Expander.Header>
   <Expander.Content>
     <ScrollViewer Height="50">
       <TextBlock TextWrapping="Wrap">
         Lorem ipsum dolor sit amet, consectetur adipisicing elit, 
         sed do eiusmod tempor incididunt ut labore et dolore magna 
         aliqua. Ut enim ad minim veniam, quis nostrud exercitation 
         ullamco laboris nisi ut aliquip ex ea commodo consequat. 
         Duis aute irure dolor in reprehenderit in voluptate velit 
         esse cillum dolore eu fugiat nulla pariatur. Excepteur sint 
         occaecat cupidatat non proident, sunt in culpa qui officia 
         deserunt mollit anim id est laborum.
       </TextBlock>
     </ScrollViewer>
   </Expander.Content>
 </Expander>
//Create Expander object
Expander exp = new Expander();

//Create Bullet Panel for Expander Header
BulletDecorator bp = new BulletDecorator();
Image i = new Image();
BitmapImage bi= new BitmapImage(); 
bi.UriSource = new Uri(@"pack://application:,,/images/icon.jpg");
i.Source = bi;
i.Width = 10;
bp.Bullet = i;
TextBlock tb = new TextBlock();
tb.Text = "My Expander";
tb.Margin = new Thickness(20,0,0,0);     
bp.Child = tb;
exp.Header = bp;

//Create TextBlock with ScrollViewer for Expander Content
StackPanel spScroll = new StackPanel();
TextBlock tbc = new TextBlock();
tbc.Text =
        "Lorem ipsum dolor sit amet, consectetur adipisicing elit," +
        "sed do eiusmod tempor incididunt ut labore et dolore magna" +
        "aliqua. Ut enim ad minim veniam, quis nostrud exercitation" +
        "ullamco laboris nisi ut aliquip ex ea commodo consequat." +
        "Duis aute irure dolor in reprehenderit in voluptate velit" +
        "esse cillum dolore eu fugiat nulla pariatur. Excepteur sint" +
        "occaecat cupidatat non proident, sunt in culpa qui officia" +
        "deserunt mollit anim id est laborum.";
tbc.TextWrapping = TextWrapping.Wrap;

spScroll.Children.Add(tbc);
ScrollViewer scr = new ScrollViewer();
scr.Content = spScroll;
scr.Height = 50;
exp.Content = scr;

exp.Width=200;  
exp.HorizontalContentAlignment= HorizontalAlignment.Stretch;
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