I am sorry, I thought you mean an ASP control. here is the WPF one:
first the markups:
<Grid>
<StackPanel Name="Tabs" HorizontalAlignment="Left" Width="70">
<StackPanel Name="Tab1" >
<Label Content="Tab1" Height="30" />
</StackPanel>
<StackPanel Name="Tab2" >
<Label Content="Tab2" Height="30" />
</StackPanel>
</StackPanel>
<StackPanel Name="Contents" Margin="70,0,0,0" >
<StackPanel Name="Content1">
<Label Content="Content Content Content" />
<Label Content="Content Content Content" />
</StackPanel>
<StackPanel Name="Content2" Visibility="Hidden">
<Label Content="Content Content Content" />
<Label Content="Content Content Content" />
</StackPanel>
</StackPanel>
</Grid>
after that handle the clicks on the tabs to togle the visibility of the contents.