<TabControl cal:RegionManager.RegionName="TabRegion">
                <TabControl.ItemTemplate>
                    <DataTemplate>
                        <WrapPanel DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:Shell}}, Path=DataContext}">
                            <TextBlock VerticalAlignment="Center">Tab Name</TextBlock>
                            <Button Margin="2,2,2,2"  VerticalAlignment="Center" Command="{Binding CloseCommand}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ContentControl}}, Path=DataContext}">X</Button>
                        </WrapPanel>
                    </DataTemplate>
                </TabControl.ItemTemplate>
            </TabControl>

<Style x:Key="TabItemHeaderStyle" TargetType="сontrols:TabItem">
        <Setter Property="HeaderTemplate">
            <Setter.Value>
                <DataTemplate>
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition  Width="*"/>
                            <ColumnDefinition  Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="{Binding TabHeader}" HorizontalAlignment="Center" Margin="0,0,2,0"></TextBlock>
                        <Button Content="x" Grid.Column="1" Command="{Binding Path=CloseCommand}"" Margin=" 2 , 0 , 0 , 0 "  ></Button>
                    </Grid>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>