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>
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