Manipulate DockPanel or some "Panel"

Hi everyone

I've been developing an application (in XAML with C#) with a left menu, like Outlook Office 2007.

I declared a TabControl with its TabItem (there are 3 TabItems) in the XAML code.

I want to link each TabItem with a DockPanel or something like aPanel in the right side of the display. But i don't know how to do it.

This is the code in XAML where i declare the TabControl and its TabItem:

<TabControl x:Name="TabControl" Template="{StaticResource OutlookTab}"><TabItem x:Name="TabItemUno" Header="TabItemUno"></TabItem><TabItem x:Name="TabItemDos" Header="TabItemDos"></TabItem><TabItem x:Name="TabItemTres" Header="TabItemTres"></TabItem></TabControl>

This is the code where i declare the DockPanels:

<DockPanel Grid.Column="1" x:Name="PanelTabItemUno" HorizontalAlignment="Center" VerticalAlignment="Center"><Label>Todo lo relacionado al TabItemUno</Label></DockPanel><DockPanel Grid.Column="1" x:Name="PanelTabItemDos" HorizontalAlignment="Center" VerticalAlignment="Center"><Label>Todo lo relacionado al TabItemDos</Label></DockPanel><DockPanel Grid.Column="1" x:Name="PanelTabItemTres" HorizontalAlignment="Center" VerticalAlignment="Center"><Label>Todo lo relacionado al TabItemTres</Label></DockPanel>

And, here i try to link the selected TabItem with its DockPanel (if i choose the TabItemOne, in the right side appears the DockPanel PanelTabItemUno):

if (TabItemUno.IsSelected)
{
PanelTabItemUno.IsEnabled = true;
}

But, it does not work ... :(

Any idea?

Thanks to all!