<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ScrollViewerWithExpander" Height="300" Width="300"> <ScrollViewer VerticalScrollBarVisibility="Auto"> <StackPanel Orientation="Vertical"> <Button Width="200" >A</Button> <Expander Header="Expand me" BorderThickness="3" BorderBrush="Black"> <StackPanel> <Button>B</Button> <Button>C</Button> <Button>D</Button> </StackPanel> </Expander> <Button Padding="10 4" HorizontalAlignment="Right">E</Button> <Button HorizontalAlignment="Stretch">F</Button> </StackPanel> </ScrollViewer> </Window>