Moi ça marche et toi non

WpfApp1/AddAShark.xaml

@@ -13,7 +13,6 @@
         </DockPanel>
         <DockPanel Background="AliceBlue">
             <TextBlock DockPanel.Dock="Top" Text="Shark information :" Margin="15" FontSize="18" Foreground="CadetBlue"/>
-            <WpfApp1:UserControlBoite/>
         </DockPanel>
     </DockPanel>
 </Window>

WpfApp1/MainWindow.xaml

@@ -41,6 +41,7 @@
             <Button x:Name="add" HorizontalAlignment="Right" VerticalAlignment="Center" Content="+" BorderBrush="AliceBlue" BorderThickness="2" Background="PowderBlue" Width="50" Height="50" FontFamily="Poppins" FontSize="25" Foreground="AliceBlue"></Button>
         </DockPanel>
         <Image Source="Images\cartemaismieuxman.png"/>
+        <local:UserControlBoite/>
     </DockPanel>
 
 

WpfApp1/UserControlBoite.xaml

@@ -1,4 +1,5 @@
-<UserControl x:Class="WpfApp1.UserControlBoite"
+
+<UserControl x:Class="WpfApp1.UserControlBoite"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"