父控件未启用WPF选项卡

Question

我正在（主要）使用MVVM的WPF应用程序上工作。我的问题是我有一个标签控件（它实际上是一个嵌套的标签控件），表现得很奇怪。在冗长的后台处理期间（这是我想要的行为！）禁用父控件，但是当后台内容完成并且父级重新启用时，其中一个嵌套选项卡保持禁用状态。并且违规选项卡会根据在后台操作之前选择的选项进行更改;有时第二个选项卡将保持禁用状态，有时第三个选项卡将保持禁用状态。

我实际上并没有触及＆＃34; IsEnabled＆＃34;单个选项卡的属性，通过数据绑定或通过代码隐藏。只有父控件（在重要的情况下是一个网格）被禁用。

我很欣赏任何调试这个的策略;什么原因会导致一个标签与其他标签区别对待？

实际上不需要后台处理来重现问题。它也可以通过在代码隐藏中禁用和重新启用父网格来实现：

private void test1_Click(object sender, RoutedEventArgs e)
{
   myGrid.IsEnabled = false;
}

private void test2_Click(object sender, RoutedEventArgs e)
{
    myGrid.IsEnabled = true;
}

编辑：我可能已将问题缩小到以下样式。如果我通过添加一个键暂时禁用该样式，那么问题就会消失;但我当然希望保持标签的视觉外观：

<Style TargetType="{x:Type TabItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TabItem}">

                <Grid Height="{Binding Path=HeaderHeight, ElementName=uc}" VerticalAlignment="Bottom">
                    <Border Name="Border"
                                Background="{StaticResource TabItem_BackgroundBrush_Unselected}"
                                BorderBrush="{StaticResource TabItem_BorderBrush_Selected}"
                                Margin="{StaticResource TabItemMargin_Selected}"
                                BorderThickness="2,1,1,0"
                                CornerRadius="3,3,0,0"
                                >
                        <Border BorderBrush="{StaticResource TabItem_BorderBrush_Selected}"
                                BorderThickness="0,0,0,1"
                                Margin="0"
                                Name="BottomBorder"
                                >
                        <ContentPresenter x:Name="ContentSite"
                                          VerticalAlignment="Center"
                                          HorizontalAlignment="Center"
                                          ContentSource="Header"
                                          Margin="7,2,12,2"
                                          RecognizesAccessKey="True"
                                          />
                        </Border>
                    </Border>
                </Grid>

                <ControlTemplate.Triggers>
                    <!-- TabItem appearance when NOT selected -->
                    <Trigger Property="IsSelected" Value="False">
                        <Setter Property="Panel.ZIndex" Value="90" />
                        <Setter TargetName="Border" Property="BorderBrush"
                                Value="{StaticResource TabItem_Border_Unselected}" />
                        <Setter Property="Foreground"
                                Value="{StaticResource TabItem_TextBrush_Unselected}" />
                        <Setter TargetName="Border" Property="Margin"
                                Value="{StaticResource TabItemMargin_Base}" />
                    </Trigger>

                    <!-- TabItem appearance when disabled -->
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="Panel.ZIndex" Value="80" />
                        <Setter TargetName="Border" Property="BorderBrush"
                                Value="{StaticResource TabItem_DisabledBorderBrush}" />
                        <Setter TargetName="Border" Property="Background"
                                Value="{StaticResource TabItem_BackgroundBrush_Disabled}" />
                        <Setter Property="Foreground"
                                Value="{StaticResource TabItem_TextBrush_Disabled}" />
                    </Trigger>

                    <!-- TabItem appearance when hovering -->
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="Border.IsMouseOver" Value="True" />
                            <Condition Property="IsSelected" Value="False" />
                        </MultiTrigger.Conditions>
                        <Setter Property="Panel.ZIndex" Value="99" />
                        <Setter Property="Foreground" Value="{StaticResource TabItem_TextBrush_Hover}" />
                        <Setter TargetName="Border" Property="BorderBrush"
                                Value="{StaticResource TabItem_HoverBorderBrush}" />
                        <Setter TargetName="Border" Property="BorderThickness"
                                Value="2,1,1,1" />
                        <Setter TargetName="BottomBorder" Property="BorderThickness"
                                Value="0,0,0,0" />
                        <Setter TargetName="Border" Property="Background"
                                Value="{StaticResource TabItem_HoverBackgroundBrush}" />
                        <Setter TargetName="Border" Property="Margin"
                                Value="{StaticResource TabItemMargin_Hover}" />
                    </MultiTrigger>

                    <!-- TabItem appearance when active/selected -->
                    <Trigger Property="IsSelected" Value="True">
                        <Setter Property="Panel.ZIndex" Value="100" />
                        <Setter TargetName="Border" Property="BorderBrush"
                                Value="{StaticResource TabItem_BorderBrush_Selected}" />
                        <Setter TargetName="Border" Property="Background"
                                Value="{StaticResource TabItem_BackgroundBrush_Selected}" />
                        <Setter TargetName="BottomBorder" Property="BorderThickness"
                                Value="0,0,0,0" />
                        <Setter TargetName="Border" Property="BorderThickness"
                                Value="1,1,1,0" />
                        <Setter Property="Foreground" Value="{StaticResource TabItem_TextBrush_Selected}" />
                        <Setter TargetName="Border" Property="Margin"
                                Value="{StaticResource TabItemMargin_Selected}" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>