How to change the orientation of column header text to vertical in WinRT DataGrid?

<Window.Resources>
    <!--Column Header Style as rotate 90 degree. -->
    <Style x:Key="GridHeaderCellControlStyle1" TargetType="{x:Type syncfusion:GridHeaderCellControl}">
        <Setter Property="Background" Value="LightSkyBlue"/>
        <Setter Property="Foreground" Value="Black"/>
        <Setter Property="BorderBrush" Value="Black"/>
        <Setter Property="BorderThickness" Value="0.5,0.5,0.5,0.5"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="Padding" Value="5,3"/>
        <Setter Property="FontFamily" Value="Segoe UI"/>
        <Setter Property="FontSize" Value="14"/>
        <Setter Property="FontWeight" Value="Normal"/>
        <Setter Property="IsTabStop" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type syncfusion:GridHeaderCellControl}">
                    <Grid>
                        <Grid.LayoutTransform>
                            <RotateTransform Angle="90"/>
                        </Grid.LayoutTransform>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="HiddenColumnsResizingStates">
                                <VisualState x:Name="PreviousColumnHidden">
                                    <Storyboard>
                                        <ThicknessAnimationUsingKeyFrames BeginTime="0" Duration="1.0:0:0" Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="PART_HeaderCellBorder">
                                            <EasingThicknessKeyFrame KeyTime="0" Value="3,0,1,1"/>
                                        </ThicknessAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="HiddenState">
                                    <Storyboard>
                                        <ThicknessAnimationUsingKeyFrames BeginTime="0" Duration="1.0:0:0" Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="PART_HeaderCellBorder">
                                            <EasingThicknessKeyFrame KeyTime="0" Value="3,0,3,1"/>
                                        </ThicknessAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="NormalState"/>
                                <VisualState x:Name="LastColumnHidden">
                                    <Storyboard>
                                        <ThicknessAnimationUsingKeyFrames BeginTime="0" Duration="1.0:0:0" Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="PART_HeaderCellBorder">
                                            <EasingThicknessKeyFrame KeyTime="0" Value="0,0,3,1"/>
                                        </ThicknessAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="MouseOver"/>
                                <VisualState x:Name="Normal"/>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="BorderStates">
                                <VisualState x:Name="NormalCell"/>
                                <VisualState x:Name="FooterColumnCell">
                                    <Storyboard BeginTime="0">
                                        <ThicknessAnimationUsingKeyFrames BeginTime="0" Duration="1.0:0:0" Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="PART_FooterCellBorder">
                                            <EasingThicknessKeyFrame KeyTime="0" Value="1,0,1,1"/>
                                        </ThicknessAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="BeforeFooterColumnCell">
                                    <Storyboard BeginTime="0">
                                        <ThicknessAnimationUsingKeyFrames BeginTime="0" Duration="1.0:0:0" Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="PART_FooterCellBorder">
                                            <EasingThicknessKeyFrame KeyTime="0" Value="0,0,0,1"/>
                                        </ThicknessAnimationUsingKeyFrames>
                                        <ThicknessAnimationUsingKeyFrames BeginTime="0" Duration="1.0:0:0" Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="PART_HeaderCellBorder">
                                            <EasingThicknessKeyFrame KeyTime="0" Value="0,0,0,1"/>
                                        </ThicknessAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="PART_FooterCellBorder" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}"/>
                        <Border x:Name="PART_HeaderCellBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                            <Grid Margin="{TemplateBinding Padding}" SnapsToDevicePixels="True">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition Width="Auto"/>
                                </Grid.ColumnDefinitions>
                                <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="Center"/>
                                <Grid x:Name="PART_SortButtonPresenter" Grid.Column="1" SnapsToDevicePixels="True">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*">
                                            <ColumnDefinition.MinWidth>
                                                <Binding Mode="OneWay" Path="SortDirection" RelativeSource="{RelativeSource TemplatedParent}">
                                                    <Binding.Converter>
                                                        <syncfusion:SortDirectionToWidthConverter/>
                                                    </Binding.Converter>
                                                </Binding>
                                            </ColumnDefinition.MinWidth>
                                        </ColumnDefinition>
                                        <ColumnDefinition Width="*"/>
                                    </Grid.ColumnDefinitions>
                                    <Path Data="F1M753.644,-13.0589L753.736,-12.9639 753.557,-12.7816 732.137,8.63641 732.137,29.7119 756.445,5.40851 764.094,-2.24384 764.275,-2.42352 771.834,5.1286 796.137,29.4372 796.137,8.36163 774.722,-13.0589 764.181,-23.5967 753.644,-13.0589z" Fill="Gray" HorizontalAlignment="Center" Height="8.138" Stretch="Fill" SnapsToDevicePixels="True" VerticalAlignment="Center" Width="8.938">
                                        <Path.RenderTransform>
                                            <TransformGroup>
                                                <RotateTransform Angle="90"/>
                                                <ScaleTransform ScaleY="1" ScaleX="1"/>
                                            </TransformGroup>
                                        </Path.RenderTransform>
                                        <Path.Visibility>
                                            <Binding ConverterParameter="Ascending" Path="SortDirection" RelativeSource="{RelativeSource TemplatedParent}">
                                                <Binding.Converter>
                                                    <syncfusion:SortDirectionToVisibilityConverter/>
                                                </Binding.Converter>
                                            </Binding>
                                        </Path.Visibility>
                                    </Path>
                                    <Path Data="F1M181.297,177.841L181.205,177.746 181.385,177.563 202.804,156.146 202.804,135.07 178.497,159.373 170.847,167.026 170.666,167.205 163.107,159.653 138.804,135.345 138.804,156.42 160.219,177.841 170.76,188.379 181.297,177.841z" Fill="Gray" HorizontalAlignment="Center" Height="8.138" Stretch="Fill" SnapsToDevicePixels="True" VerticalAlignment="Center" Width="8.938">
                                        <Path.RenderTransform>
                                            <TransformGroup>
                                                <RotateTransform Angle="90"/>
                                                <ScaleTransform ScaleY="1" ScaleX="1"/>
                                            </TransformGroup>
                                        </Path.RenderTransform>
                                        <Path.Visibility>
                                            <Binding ConverterParameter="Decending" Path="SortDirection" RelativeSource="{RelativeSource TemplatedParent}">
                                                <Binding.Converter>
                                                    <syncfusion:SortDirectionToVisibilityConverter/>
                                                </Binding.Converter>
                                            </Binding>
                                        </Path.Visibility>
                                    </Path>
                                    <TextBlock Grid.Column="1" Foreground="{TemplateBinding Foreground}" FontSize="10" Margin="0,-4,0,0" SnapsToDevicePixels="True" Text="{TemplateBinding SortNumber}" Visibility="{TemplateBinding SortNumberVisibility}" VerticalAlignment="Center"/>
                                </Grid>
                                <syncfusion:FilterToggleButton x:Name="PART_FilterToggleButton" Grid.Column="2" HorizontalAlignment="Stretch" SnapsToDevicePixels="True" Visibility="{TemplateBinding FilterIconVisiblity}" VerticalAlignment="Stretch"/>
                                <Border x:Name="PART_FilterPopUpPresenter"/>
                            </Grid>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>

<syncfusion:SfDataGrid  x:Name="datagrid"
                        AutoGenerateColumns="False"
                        ItemsSource="{Binding EmployeeDetails}"
                        HeaderRowHeight="100"
                        HeaderStyle="{DynamicResource GridHeaderCellControlStyle1}"
                        ColumnSizer="Auto"> 
</syncfusion:SfDataGrid>