Dev des 4 User Panels Resizables avec un pivot basique.
Test direct dans la solution FingersDance
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:Custom="http://schemas.microsoft.com/surface/2008"
x:Class="FingersDance.Debug.UserControlDebug"
x:Name="UserControl" Width="122" Height="152">
<Grid x:Name="LayoutRoot">
<Custom:SurfaceListBox Name="listbox" />
</Grid>
</UserControl>