ToolBar : Item non désiré en dernier

Bonjour à tous,

Sans doute que cette question a déjà été traité, mais je n'ai pas réussi à trouver de réponse ... sans doute à cause d'une mauvaise formulation ...

Mon problème est que j'ai toujours l'item ci-dessous que je souhaite masquer.
Comment faire ?

Pièce jointe 492211
Code:
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<!-- TOOLS BAR -->
        <ToolBar Name="toolBar" ToolBarTray.IsLocked="True" Grid.Row="0" Margin="4" Cursor="Hand" Background="#1E2E2E" HorizontalContentAlignment="Stretch" >
            <Button Name="btnNewProject" Click="btnNewProject_Click" ToolTip="Créer un nouveau projet de test" Cursor="Hand" VerticalAlignment="Stretch" Margin="4" >
                <Grid>
                    <fa:ImageAwesome Icon="Folder" Height="22" Foreground="LightGray" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="4" />
                    <fa:ImageAwesome Icon="Plus" Height="8" Foreground="Blue" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="4" />
                </Grid>
            </Button>
            <Separator Margin="4" Name="sepaToolBar" />
            <Button Name="btnOpenProject" Click="btnOpenProject_Click" ToolTip="Ouvrir un projet de test existant" Cursor="Hand" >
                <fa:ImageAwesome Icon="FolderOpen" Height="22" Foreground="LightGray" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="4" />
            </Button>
            <Button Name="btnSaveProject" Click="btnSaveProject_Click" ToolTip="Sauvegarder le projet de test" Cursor="Hand" >
                <fa:ImageAwesome Icon="Save" Height="22" Foreground="LightGray" HorizontalAlignment="Center" VerticalAlignment="Top" />
            </Button>
            <Button Name="btnSaveAsProject" Click="btnSaveAsProject_Click" ToolTip="Sauvegarder le projet de test sous ..." Cursor="Hand" >
                <Grid>
                    <fa:ImageAwesome Icon="Save" Height="22" Foreground="LightGray" HorizontalAlignment="Center" VerticalAlignment="Top" />
                    <fa:ImageAwesome Icon="EllipsisH" Height="5" Foreground="Blue" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,0,10,6" />
                </Grid>
            </Button>
 
            <ToggleButton Name="btnLunchTest" Click="btnLunchTest_Click" ToolTip="Lancer le test" Cursor="Hand" Margin="100,4,4,4" HorizontalAlignment="Right" VerticalAlignment="Center" >
                <fa:ImageAwesome Icon="PlayCircleOutline" Height="22" Foreground="Orange" HorizontalAlignment="Center" VerticalAlignment="Top" />
            </ToggleButton>
            <StackPanel Orientation="Horizontal" Grid.Row="2" Grid.Column="1" Margin="60,4,4,4" >
                <Button Name="btnRefreshPorts" Click="btnRefreshPorts_Click" Grid.Column="3" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center" BorderThickness="0" Cursor="Hand" Margin="4">
                    <fa:ImageAwesome Icon="Refresh" Height="22" Foreground="LightGray" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="4" />
                </Button>
                <Label Content="Port COM :" Foreground="White" Margin="2" VerticalAlignment="Center" />
                <ComboBox Name="cbbPortCom" BorderBrush="DarkGray" Background="Black" Grid.Column="2" Cursor="Hand" SelectionChanged="CbbPortCom_SelectionChanged" VerticalAlignment="Center" Margin="4" />
            </StackPanel>
            <Grid Name="grdConfigProjet">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <!-- Client / Produit -->
                <Label Content="Client :" Foreground="White" Margin="2" VerticalAlignment="Center" />
                <ComboBox Name="cbbClients" Grid.Column="1" MinWidth="100" Cursor="Hand" ItemsSource="{Binding}" ItemTemplate="{StaticResource LIbelleDataTemplate}" SelectionChanged="CbbClients_SelectionChanged" VerticalAlignment="Center" Margin="2" />
                <Label Content="Produit :" Grid.Column="2" Foreground="White" Margin="2" VerticalAlignment="Center" />
                <ComboBox Name="cbbProduits" Grid.Column="3" MinWidth="100" Cursor="Hand" ItemsSource="{Binding}" ItemTemplate="{StaticResource LIbelleDataTemplate}" SelectionChanged="CbbProduits_SelectionChanged" VerticalAlignment="Center" Margin="2" />
                <!-- Speed Com -->
                <Label Content="Vitesse :" Grid.Column="4" Foreground="White" Margin="2" VerticalAlignment="Center" />
                <ComboBox Name="cbbSpeedCom" Grid.Column="5" SelectionChanged="cbbSpeedCom_SelectionChanged" Width="100" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="2" />
            </Grid>
        </ToolBar>
Merci à ceux qui savent et désolé si c'est une question stupide :D