刷新tabcontrol特定的tabitem标头，但不刷新tabitem的全部内容

Question

我想在WPF C＃中的tabitems的标题中显示一个加载器gif，我的tabitems动态生成，并用特定的图标替换加载器gif（如果可用），因此当我这样做this.tabcontrol.items.refresh我的所有标签会刷新其内容，因此整个屏幕在刷新整个屏幕时都会出现抽搐。

我已经尝试过this.tabcontrol.items.refresh（），但它会刷新所有标签及其内容。

这是样式

 <Setter Property="ContentStringFormat" Value="{Binding Path=timergif ,diagnostics:PresentationTraceSources.TraceLevel=High}"></Setter>
            <Setter Property="Tag" Value="{Binding Path=LabelText2 ,diagnostics:PresentationTraceSources.TraceLevel=High}"></Setter>
            <Setter Property="Header"  Value="{Binding Path=LabelText ,diagnostics:PresentationTraceSources.TraceLevel=High}" />

 <Style  TargetType="{x:Type tab:FabTabItem}">
            <Setter Property="ContentStringFormat" Value="{Binding Path=timergif ,diagnostics:PresentationTraceSources.TraceLevel=High}"></Setter>
            <Setter Property="Tag" Value="{Binding Path=LabelText2 ,diagnostics:PresentationTraceSources.TraceLevel=High}"></Setter>
            <Setter Property="Header"  Value="{Binding Path=LabelText ,diagnostics:PresentationTraceSources.TraceLevel=High}" />

            <Setter Property="Height" Value="30" />

            <Setter Property="Background" Value="{DynamicResource MyFillBrush}" />
            <Setter Property="HeaderTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">

                            <!--<Image Height="25" Margin="4,0,4,0"
        Source="{Binding Tag, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TabItem}}}" />-->
                            <!--<MediaElement Height="25" Width="25" Margin="4,0,4,0" x:Name="myGif"  UnloadedBehavior="Manual"     Source="Loading_icon.gif" LoadedBehavior="Play" Stretch="None"/>-->

                            <Image Width="20"  gif:ImageBehavior.AnimatedSource="{Binding Tag, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TabItem}}}" />
                            <Label Content="{Binding}"/>
                            <Image Width="20"  gif:ImageBehavior.AnimatedSource="{Binding ContentStringFormat, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TabItem}}}" />
                          <!--<Image Width="20"  gif:ImageBehavior.AnimatedSource="{Binding Path=(local:BrowserWindow.LabelText),RelativeSource={RelativeSource TemplatedParent} }" />-->
                            <!--<StackPanel Orientation="Vertical">
                                --><!--<Image Height="25" Margin="4,0,4,0"
        Source="{Binding Tag, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TabItem}}}" />-->
                                <!--<MediaElement Height="25" Width="25" Margin="4,0,4,0" x:Name="myGif"  UnloadedBehavior="Manual"     Source="Loading_icon.gif" LoadedBehavior="Play" Stretch="None"/>--><!--



                            </StackPanel>-->
                        </StackPanel>


                    </DataTemplate>

                </Setter.Value>
            </Setter>
            <!--<Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type tab:FabTabItem}">
                        <Border Name="Border" BorderThickness="1,1,1,0" BorderBrush="Gainsboro" CornerRadius="4,4,0,0" Margin="2,0">
                            <ContentPresenter x:Name="ContentSite"
                                        VerticalAlignment="Center"
                                        HorizontalAlignment="Center"
                                        ContentSource="Header"
                                        Margin="10,2"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="True">
                                <Setter TargetName="Border" Property="Background" Value="LightSkyBlue" />
                            </Trigger>
                            <Trigger Property="IsSelected" Value="False">
                                <Setter TargetName="Border" Property="Background" Value="GhostWhite" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>-->
        </Style>   

  _mainForm.tabControl.Items.Refresh();

我希望仅刷新特定Tabitem标题中的图像。