This example describes how to use Expander in
WPF.
<Window
x:Class="LayoutDemo.wndExpander"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="wndExpander"
Height="300"
Width="300">
<Grid>
<Expander
Header="This
goes to Header"
Margin="50"
IsExpanded="True"
ExpandDirection="Down">
<StackPanel>
<Image
Height="140"
Source="/LayoutDemo;component/toofast.jpg"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"></Image>
</StackPanel>
</Expander>
<Expander
Header="This
goes to Header"
Margin="50"
IsExpanded="True"
ExpandDirection="Down"
Expanded="Expander_Expanded">
<StackPanel>
<Image
Height="140"
Source="/LayoutDemo;component/Images/Penguins.jpg"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"></Image>
</StackPanel>
</Expander>
</Grid>
</Window>