<TabControl
      AutomationProperties.AutomationId="MainTabControl"
      cal:RegionManager.RegionName="{x:Static inf:RegionNames.MainRegion}"
      Width="Auto" Height="Auto" Margin="10,10,0,0"
      HorizontalAlignment="Stretch"
      IsSynchronizedWithCurrentItem="True"
      ItemTemplate="{StaticResource TabItemTemplate}"
SelectionChanged="TabControl_SelectionChanged">

<DataTemplate x:Key="ClosableTabItemTemplate">
            <DockPanel Width="120">
                <Button
                    Command="inf:CloseCommands.CloseCommand"
                    Content="X"
                    Cursor="Hand"
                    DockPanel.Dock="Right"
                    Focusable="False"
                    FontFamily="Courier"
                    FontSize="9"
                    FontWeight="Bold"
                    Margin="0,1,0,0"
                    Padding="0"
                    VerticalContentAlignment="Bottom"
                    Width="16" Height="16"
                    />
                <ContentPresenter
        Content="{Binding}"
        VerticalAlignment="Center"
        />
            </DockPanel>
        </DataTemplate>