Equivalent de Multiline dans le TabControl WPF

Tu peux utiliser un template de ce genre (inspiré de l'exemple dans la doc de la classe TabPanel).

Code:

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        <ControlTemplate TargetType="{x:Type TabControl}">
          <Grid KeyboardNavigation.TabNavigation="Local">
            <Grid.RowDefinitions>
              <RowDefinition Height="Auto"/>
              <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <ScrollViewer Grid.Row="0" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Hidden">
              <StackPanel Name="HeaderPanel" 
                          Orientation="Horizontal"
                          IsItemsHost="True">
              </StackPanel>
            </ScrollViewer>
            <Border     Name="Border" 
                        Grid.Row="1" 
                        Background="{TemplateBinding Background}" 
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="1" 
                        CornerRadius="2" 
                        KeyboardNavigation.TabNavigation="Local"
                        KeyboardNavigation.DirectionalNavigation="Contained"
                        KeyboardNavigation.TabIndex="2" >
              <ContentPresenter 
                Name="PART_SelectedContentHost"
                Margin="4"
                ContentSource="SelectedContent" />
            </Border>
          </Grid>
        </ControlTemplate>

Le résultat est très moche, mais tu vois le principe... ;)