Use Expander : Expander « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. Expander

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      HorizontalAlignment="Center" VerticalAlignment="Center">

<StackPanel Orientation="Horizontal">
  <Expander Header="Glass" IsExpanded="True" Background="#def" VerticalAlignment="Center" MinWidth="90" Margin="10,0">
    <Border Margin="2" Background="White" Padding="3">
      <StackPanel>
        <RadioButton Content="Half-full" IsChecked="True" />
        <RadioButton Content="Half-empty" />
      </StackPanel>
    </Border>
  </Expander>
</StackPanel>
</Page>

16.46.Expander
	16.46.1.	Display Content in an Expander
	16.46.2.	Multi Direction Expanders
	16.46.3.	Use Expander
	16.46.4.	Use the Expander control and set the ExpandDirection property