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:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
x:Class="FingersDance.SurfaceWindow1"
Title="FingersDance"
Width="1024" Height="768" x:Name="mainSurfaceWindow"
xmlns:FingersDance_Control_UserPanel="clr-namespace:FingersDance.Control.UserPanel;assembly=FingersDance.Control.UserPanel"
>
<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}" x:Name="MainGrid" Width="1024" Height="768" >
<Grid HorizontalAlignment="Left" x:Name="Grid1" VerticalAlignment="Top" Width="100" Height="100" Background="#7EFAFAFA">
<FingersDance_Control_UserPanel:UserControlUserPanel/>
<Rectangle Fill="{x:Null}" Stroke="#FFFFFFFF"/>
</Grid>
<Grid HorizontalAlignment="Right" Margin="0,0,0,0" x:Name="Grid4" VerticalAlignment="Top" Width="100" Height="100" Background="#7FFFFFFF">
<FingersDance_Control_UserPanel:UserControlUserPanel/>
<Rectangle Fill="{x:Null}" Stroke="#FFFFFFFF"/>
</Grid>
<Grid HorizontalAlignment="Right" Margin="0,0,0,0" x:Name="Grid3" VerticalAlignment="Bottom" Width="100" Height="100" Background="#7FFFFFFF">
<FingersDance_Control_UserPanel:UserControlUserPanel/>
<Rectangle Fill="{x:Null}" Stroke="#FFFFFFFF"/>
</Grid>
<Grid RenderTransformOrigin="0.5,0.5" HorizontalAlignment="Left" Margin="0,0,0,0" x:Name="Grid2" VerticalAlignment="Bottom" Width="100" Height="100" Background="#7EFFFFFF">
<Grid.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="1" ScaleY="1"/>
<SkewTransform AngleX="0" AngleY="0"/>
<RotateTransform Angle="0"/>
<TranslateTransform X="0" Y="0"/>
</TransformGroup>
</Grid.RenderTransform>
<Rectangle Fill="{x:Null}" Stroke="#FFFFFFFF"/>
<FingersDance_Control_UserPanel:UserControlUserPanel/>
</Grid>
<s:ScatterView x:Name="ScaterView" ContactChanged="ScaterView_ContactChanged">
<s:ScatterViewItem CanMove="True" CanRotate="False" CanScale="False" >
<Ellipse Width="55" Height="55" Fill="#FF101010" Stroke="#FF000000" x:Name="pivot" RenderTransformOrigin="0.5,0.5">
<Ellipse.RenderTransform>
<TransformGroup>
<ScaleTransform ScaleX="1" ScaleY="1"/>
<SkewTransform AngleX="0" AngleY="0"/>
<RotateTransform Angle="0"/>
<TranslateTransform X="0" Y="0"/>
</TransformGroup>
</Ellipse.RenderTransform>
</Ellipse>
</s:ScatterViewItem>
</s:ScatterView>
</Grid>
</s:SurfaceWindow>