Dev des 4 User Panels Resizables avec un pivot basique.
Test direct dans la solution FingersDance
<s:SurfaceWindow
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:s="http://schemas.microsoft.com/surface/2008"
xmlns:FingersDance_Control_UserPanel="clr-namespace:FingersDance.Control.UserPanel;assembly=FingersDance.Control.UserPanel"
x:Class="Control.UserPanel.Test.SurfaceWindow1"
Title="Control.UserPanel.Test"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Height="768" Width="1024"
>
<s:SurfaceWindow.Resources>
<ImageBrush x:Key="WindowBackground" Stretch="None" Opacity="0.6" ImageSource="pack://application:,,,/Resources/WindowBackground.jpg"/>
</s:SurfaceWindow.Resources>
<Grid Background="{StaticResource WindowBackground}" Height="768" Width="1024">
<FingersDance_Control_UserPanel:UserControlUserPanel x:Name="UserControlUserPanel1" d:LayoutOverrides="HorizontalAlignment, VerticalAlignment" Height="286.724" HorizontalAlignment="Left" VerticalAlignment="Top" Width="331.733" />
<FingersDance_Control_UserPanel:UserControlUserPanel x:Name="UserControlUserPanel2" Margin="15.003,288.391,325.065,56.678" d:LayoutOverrides="HorizontalAlignment, VerticalAlignment" />
</Grid>
</s:SurfaceWindow>