How to set the Background color of Header and disable TabStrip Button in TabNavigation Control

<Window x:Class="TabNaviga.MainWindow"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 Title="TabNavigationControl" Height="350" Width="525" xmlns:syncfusion="http://schemas.syncfusion.com/wpf">
 
 <Window.Resources>
  <Style x:Key="TabNavigationControlStyle" TargetType="syncfusion:TabNavigationControl">        
    <Setter Property="BorderBrush" Value="{StaticResource BorderBrush}"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="Background" Value="{StaticResource BackgroundBrush}" />
    <Setter Property="Foreground" Value="{StaticResource Foreground}" />
    <Setter Property="Template">
      <Setter.Value>
       <ControlTemplate TargetType="syncfusion:TabNavigationControl">
         <Grid FocusVisualStyle="{x:Null}">
           <Border CornerRadius="8" Margin="0,0,0,0" BorderBrush="{TemplateBinding BorderBrush} FocusVisualStyle="{x:Null}" Background="{TemplateBinding Background}"
 BorderThickness="{TemplateBinding BorderThickness}">
             <Grid x:Name="Root" FocusVisualStyle="{x:Null}" IsManipulationEnabled="{TemplateBinding EnableTouch}">
               <Grid.RowDefinitions>
                 <RowDefinition Height="*" />
                 <RowDefinition Height="Auto" />
               </Grid.RowDefinitions>
               <ContentControl x:Name="PART_OldContent" IsTabStop="False" Grid.Row="0" />
               <ContentControl x:Name="PART_SelectedContent" IsTabStop="{Binding Path=SelectedTabItem.IsTabStop, RelativeSource= {RelativeSource FindAncestor, AncestorType={x:Type syncfusion:TabNavigationControl}}}" Content="{Binding Path=SelectedTabItem.Content, RelativeSource={RelativeSource TemplatedParent}}" Grid.Row="0" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch" ContentTemplate="{Binding Path=ItemTemplate,RelativeSource={RelativeSource TemplatedParent}}">
               </ContentControl>
               <ContentControl x:Name="PART_FrontOldContent" IsTabStop="False" Grid.Row="0" IsHitTestVisible="False" />
               <Border Grid.Row="1" Visibility="{TemplateBinding HeaderVisibility}" Background="Blue" BorderBrush="{StaticResource BorderBrush}" CornerRadius="0 0 8 8" Height="37">
                 <Grid Margin="3,0,0,0">
                    <ContentControl IsTabStop="False" Content="{Binding Path=SelectedTabItem.Header, RelativeSource= {RelativeSource FindAncestor, AncestorType= {x:Type syncfusion:TabNavigationControl}}}" VerticalAlignment="Center" Margin="3" FontWeight="Bold" />
                 </Grid>
               </Border>
               <ItemsPresenter IsHitTestVisible="False" HorizontalAlignment="Center" Opacity="{Binding Path=TabStripVisibility, RelativeSource= {RelativeSource FindAncestor, AncestorType= {x:Type syncfusion:TabNavigationControl}}, Converter= {StaticResource BooleanToOpacityConvert}}" VerticalAlignment="Center" Grid.Row="1" />
             </Grid>
           </Border>
           <Button Visibility="{TemplateBinding NavigationButtonVisibility}" FontSize="20" Foreground="{StaticResource BorderBrush}" FontFamily="Wingdings 3" Grid.Row="1"  HorizontalAlignment="Left" VerticalAlignment="Center" Style="{StaticResource NavigationButtonStyle}" Margin="-20 0 0 0" Command="{Binding Path=PreviousCommand, RelativeSource={RelativeSource TemplatedParent}}">
             <Button.Template>
               <ControlTemplate TargetType="Button">
                 <Grid Cursor="Hand">
                    <Rectangle Height="40" Width="40" Stroke="{StaticResource BorderBrush}" Fill="{StaticResource BackgroundBrush}" RadiusX="12" RadiusY="12" x:Name="Ellipse" />
                    <Path x:Name="PART_Presenter" Data="M-68.5,52 L-54,69.5 -68.787684,85.24501" HorizontalAlignment="Center" Margin="20,0,0,0" Stretch="Fill" Stroke="{StaticResource BorderBrush}" Width="10.03" Fill="{x:Null}" StrokeThickness="3" Height="18.553" VerticalAlignment="Center">
                      <Path.RenderTransform>
                        <TransformGroup>
                          <ScaleTransform ScaleY="1" ScaleX="-1" />
                          <SkewTransform AngleY="0" AngleX="0" />
                          <RotateTransform Angle="0" />
                          <TranslateTransform />
                        </TransformGroup>
                      </Path.RenderTransform>
                    </Path>
                 </Grid>
                 <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="False">
                      <Setter Property="Visibility" Value="Collapsed" TargetName="Ellipse"></Setter>
                      <Setter Property="Visibility" Value="Collapsed" TargetName="PART_Presenter"></Setter>
                    </Trigger>
                    <Trigger Property="IsMouseOver" Value="True">
                      <Setter Property="Fill" Value="{StaticResource MouseOverBrush}" TargetName="Ellipse"></Setter>
                      <Setter Property="Stroke" Value="{StaticResource MouseOverBorderBrush}" TargetName="Ellipse" />
                    </Trigger>
                    <Trigger Property="IsPressed" Value="True">
                      <Setter Property="Fill" Value="{StaticResource SelectedBrush}" TargetName="Ellipse" />
                      <Setter Property="Stroke" Value="{StaticResource SelectedBorderBrush}" TargetName="Ellipse" />
                    </Trigger>
                 </ControlTemplate.Triggers>
               </ControlTemplate>
             </Button.Template>
           </Button>
           <Button Grid.Row="1" Visibility="{TemplateBinding NavigationButtonVisibility}" FontSize="20" Foreground="{StaticResource BorderBrush}" FontFamily="Wingdings 3" HorizontalAlignment="Right" VerticalAlignment="Center" Style="{StaticResource NavigationButtonStyle}" Margin="0 0 -20 0" Command="{Binding Path=NextCommand, RelativeSource={RelativeSource TemplatedParent}}">
             <Button.Template>
               <ControlTemplate TargetType="Button">
                 <Grid Cursor="Hand">
                    <Rectangle Height="40" Width="40" Stroke="{StaticResource BorderBrush}" Fill="{StaticResource BackgroundBrush}" RadiusX="12" RadiusY="12" x:Name="Ellipse" />
                      <Path x:Name="PART_Presenter" Data="M-68.5,52 L-54,69.5 -68.787684,85.24501" HorizontalAlignment="Center" Stretch="Fill" Stroke="#FF6593CF" Width="10.03" Fill="{x:Null}" StrokeThickness="3" Height="18.553" VerticalAlignment="Center" />
                 </Grid>
                 <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="False">
                      <Setter Property="Visibility" Value="Collapsed" TargetName="Ellipse"></Setter>
                      <Setter Property="Visibility" Value="Collapsed" TargetName="PART_Presenter"></Setter>
                    </Trigger>
                    <Trigger Property="IsMouseOver" Value="True">
                      <Setter Property="Fill" Value="{StaticResource MouseOverBrush}" TargetName="Ellipse"></Setter>
                      <Setter Property="Stroke" Value="{StaticResource MouseOverBorderBrush}" TargetName="Ellipse" />
                    </Trigger>
                    <Trigger Property="IsPressed" Value="True">
                      <Setter Property="Fill" Value="{StaticResource SelectedBrush}" TargetName="Ellipse" />
                      <Setter Property="Stroke" Value="{StaticResource SelectedBorderBrush}" TargetName="Ellipse" />
                    </Trigger>
                 </ControlTemplate.Triggers>
               </ControlTemplate>
             </Button.Template>
           </Button>
         </Grid>
       </ControlTemplate>
      </Setter.Value>
    </Setter>
    <Setter Property="ItemsPanel">
      <Setter.Value>
        <ItemsPanelTemplate>
          <VirtualizingStackPanel x:Name="PART_ItemsPanel"
                        Orientation="Horizontal" />
        </ItemsPanelTemplate>
      </Setter.Value>
    </Setter>
  </Style>
 </Window.Resources>
 <Grid>
   <syncfusion:TabNavigationControl Name="TabNav" Style="{StaticResource TabNavigationControlStyle}" TransitionEffect="Slide" Width="400" Height="250" TabStripVisibility="Visible">
      <syncfusion:TabNavigationItem Header="1">
         <syncfusion:TabNavigationItem.Content>
            <Grid>
              <TextBlock Text="Item 1"/>
            </Grid>
         </syncfusion:TabNavigationItem.Content>
      </syncfusion:TabNavigationItem>
 
      <syncfusion:TabNavigationItem Header="2">
         <syncfusion:TabNavigationItem.Content>
            <Grid>
              <TextBlock Text="Item 2"/>
            </Grid>
         </syncfusion:TabNavigationItem.Content>
      </syncfusion:TabNavigationItem>
 
      <syncfusion:TabNavigationItem Header="3">
         <syncfusion:TabNavigationItem.Content>
            <Grid>
              <TextBlock Text="Item 3"/>
            </Grid>
         </syncfusion:TabNavigationItem.Content>
      </syncfusion:TabNavigationItem>
 
      <syncfusion:TabNavigationItem Header="4">
         <syncfusion:TabNavigationItem.Content>
            <Grid>
              <TextBlock Text="Item 4"/>
            </Grid>
         </syncfusion:TabNavigationItem.Content>
      </syncfusion:TabNavigationItem>
 
   </syncfusion:TabNavigationControl>
 </Grid>
</Window>