page.xaml

        <TabControl Margin="0" Grid.Row="2" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Name="tabControl">
            <TabItem Header="Demographics" Name="tabDemographics" HorizontalContentAlignment="Left">
                <shared:Demos x:Name="ucDemographics" AllowDrop="True" HorizontalAlignment="Left" VerticalAlignment="Stretch" Width="548" />
            </TabItem>
        </TabControl>

style.xaml

        <Style TargetType="{x:Type TabControl}">
            <Setter Property="Background" Value="#FFFFFFFF"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Padding" Value="5"/>
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            <Setter Property="VerticalContentAlignment" Value="Stretch"/>
            <Setter Property="Foreground" Value="{StaticResource OutsideFontColor}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type TabControl}">
                        <Grid ClipToBounds="true" SnapsToDevicePixels="true" KeyboardNavigation.TabNavigation="Local">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition x:Name="ColumnDefinition0" Width="*" />
                                <ColumnDefinition x:Name="ColumnDefinition1" Width="0" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" x:Name="RowDefinition0" />
                                <RowDefinition Height="*" x:Name="RowDefinition1" />
                            </Grid.RowDefinitions>
                        <Border CornerRadius="2,2,0,0" x:Name="border" Margin="0,0,0,-1.5" Panel.ZIndex="100">
                            <TabPanel x:Name="HeaderPanel" IsItemsHost="true" Panel.ZIndex="1" KeyboardNavigation.TabIndex="1" RenderTransformOrigin="0.5,0.5" Width="Auto" Height="Auto" Margin="2,0,0,0">
                                <TabPanel.LayoutTransform>
                                    <TransformGroup>
                                        <ScaleTransform ScaleX="1" ScaleY="1" />
                                        <SkewTransform AngleX="0" AngleY="0" />
                                        <RotateTransform Angle="0" />
                                        <TranslateTransform X="0" Y="0" />
                                    </TransformGroup>
                                </TabPanel.LayoutTransform>
                                <TabPanel.RenderTransform>
                                    <TransformGroup>
                                        <ScaleTransform ScaleX="1" ScaleY="1" />
                                        <SkewTransform AngleX="0" AngleY="0" />
                                        <RotateTransform />
                                        <TranslateTransform X="0" Y="0" />
                                    </TransformGroup>
                                </TabPanel.RenderTransform>

                            </TabPanel>
                        </Border>
                        <ScrollViewer Grid.Row="1" x:Name="ContentPanel" MinHeight="10" MinWidth="10" Background="#FFCCCCCC" BorderBrush="#FF979AA2" BorderThickness="{TemplateBinding BorderThickness}"
                                          HorizontalContentAlignment="Left" VerticalContentAlignment="Top" 
                                          VerticalAlignment="Top" HorizontalAlignment="Left" 
                                          HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
                            <ContentPresenter Margin="4" x:Name="PART_SelectedContentHost" ContentSource="SelectedContent" HorizontalAlignment="Stretch" />

                        </ScrollViewer>
                            <Border x:Name="DisabledVisualTop" Grid.Row="1" Grid.RowSpan="2" Background="#8CFFFFFF" CornerRadius="1" Panel.ZIndex="1" IsHitTestVisible="False" Opacity="0"/>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="TabStripPlacement" Value="Bottom">
                                <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0" />
                                <Setter Property="Height" TargetName="RowDefinition0" Value="*" />
                                <Setter Property="Height" TargetName="RowDefinition1" Value="Auto" />
                                <Setter Property="Grid.Row" TargetName="border" Value="1"/>
                                
                                <Setter Property="CornerRadius" TargetName="border" Value="0,0,2,2"/>
                                <Setter Property="Margin" TargetName="border" Value="0,-1.5,0,0"/>
                            </Trigger>
                            <Trigger Property="TabStripPlacement" Value="Left">

                                <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="0" />
                                <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0" />
                                <Setter Property="Grid.Column" TargetName="ContentPanel" Value="1" />
                                <Setter Property="Width" TargetName="ColumnDefinition0" Value="Auto" />
                                <Setter Property="Width" TargetName="ColumnDefinition1" Value="*" />
                                <Setter Property="Height" TargetName="RowDefinition0" Value="*" />
                                <Setter Property="Height" TargetName="RowDefinition1" Value="0" />
                                <Setter Property="Grid.Column" TargetName="border" Value="0"/>
                                <Setter Property="Margin" TargetName="border" Value="0,0,-1,0"/>
                                <Setter Property="Margin" TargetName="ContentPanel" Value="0,0,0,0"/>
                                <Setter Property="CornerRadius" TargetName="border" Value="0,2,2,0"/>
                                
                                <Setter Property="Margin" TargetName="HeaderPanel" Value="5,2,0,0"/>

                            </Trigger>
                            <Trigger Property="TabStripPlacement" Value="Right">
                                <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="0" />
                                <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0" />
                                <Setter Property="Grid.Column" TargetName="ContentPanel" Value="0" />
                                <Setter Property="Width" TargetName="ColumnDefinition0" Value="*" />
                                <Setter Property="Width" TargetName="ColumnDefinition1" Value="Auto" />
                                <Setter Property="Height" TargetName="RowDefinition0" Value="*" />
                                <Setter Property="Height" TargetName="RowDefinition1" Value="0" />
                                <Setter Property="Grid.Column" TargetName="border" Value="1"/>
                                
                                <Setter Property="CornerRadius" TargetName="border" Value="0,2,2,0"/>
                                <Setter Property="Margin" TargetName="border" Value="-6,2,0,0"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
                                <Setter Property="Opacity" TargetName="DisabledVisualTop" Value="1"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>