Bonjour ,
en ajoutant un BusyIndicator control , j'avais eu l'erreur
La propriété Content est définie plusieurs fois
Voici le code XAML :
Code xml : Sélectionner tout - Visualiser dans une fenêtre à part
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 <StackPanel Orientation="Vertical" x:Name="LayoutRoot" >
 
        <StackPanel.Background> 
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop x:Name="Color1" Color="#FFCFE9F8" Offset="0.260"/>
                <GradientStop x:Name="Color2" Color="#FF93C9F8" Offset="0.530"/>
                <GradientStop x:Name="Color3" Color="#FF5DAAF2" Offset="0.80"/>
            </LinearGradientBrush>
        </StackPanel.Background>
 
        <toolkit:BusyIndicator HorizontalAlignment="Center" VerticalAlignment="Center" Name="busyIndicator" IsBusy="False" >
 
 
         <StackPanel x:Name="entete" Orientation="Horizontal" Margin="3" HorizontalAlignment="Center" >
 
            <Border BorderBrush="#FFCFE9F8" BorderThickness="2,2,0,0" CornerRadius="4">
 
                <Border BorderBrush="#FF062424"  BorderThickness="0,0,2,2" CornerRadius="4">
                    <TextBlock Text="Statistiques Noesys" FontWeight="Bold" FontStretch="Normal" FontFamily="Courier New" Foreground="#FF4598AD" FontStyle="Italic" ></TextBlock>
                </Border>
 
            </Border>
 
        </StackPanel>
 
            <StackPanel x:Name="panel" Orientation="Vertical" HorizontalAlignment="Center" Margin="3">
 
 
            <Border BorderBrush="#FFCFE9F8" BorderThickness="2,2,0,0" CornerRadius="4">
 
                <Border BorderBrush="#FF062424"  BorderThickness="0,0,2,2" CornerRadius="4">
 
                        <StackPanel Orientation="Vertical" >                      
 
                            <vc:Chart x:Name="Line_chart"></vc:Chart>
 
                        <StackPanel Orientation="Horizontal" x:Name="horizontal_panel"></StackPanel>
                            <TextBlock x:Name="test" Width="150" Height="30" HorizontalAlignment="Left" ></TextBlock>
 
                        </StackPanel>
 
                </Border>
 
                </Border>
 
 
        </StackPanel>
 
 
        </toolkit:BusyIndicator>
    </StackPanel>

Ou est le problème ?