<Expander
Background="DarkGreen"
x:Name="Expander1"
Header="Expander1">
<StackPanel
Background="Blue">
<Expander
Background="Red"
Header="Expander2">
<ListBox
Background="Chocolate"
Name="listbox11">
<ListBoxItem>
<TextBlock>raj
beniwal</TextBlock>
</ListBoxItem>
<ListBoxItem
Background="Blue">
<StackPanel
Background="Yellow">
<TextBlock>dinesh
kumar</TextBlock>
<Expander
Background="Pink"
Header="Expander3">
<ListBox
Name="list2">
<ListBoxItem>
<TextBlock>rahul
saxena</TextBlock>
</ListBoxItem>
<ListBoxItem>
<TextBlock>naresh
kumar</TextBlock>
</ListBoxItem>
<ListBoxItem>
<TextBlock>suhel</TextBlock>
</ListBoxItem>
<ListBoxItem>
<TextBlock>steve</TextBlock>
</ListBoxItem>
<ListBoxItem>
<TextBlock>varman</TextBlock>
</ListBoxItem>
</ListBox>
</Expander>
</StackPanel>
</ListBoxItem>
</ListBox>
</Expander>
</StackPanel>
</Expander>
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