Определете стила за PhoneTextBox в Windows Phone

Пренаписвам стила за PhoneTextBox, променяйки фона по подразбиране на „transpanrent“, предния план на „White“ и BorderBrush на „White“, защото искам да проектирам Dark-Theme.

Но се появи проблем, че индикаторът за въвеждане на текст изчезна. Благодаря, че причината е, че предният план на индикатора за въвеждане на текст е черен, така че потребителят не може да го види. Но не мога да намеря начин да дефинирам предния план на индикатора за въвеждане на текст. Всички съвети ще бъдат приети.

PS. Не знам как да опиша индикатора, затова измислям думата „индикатор за въвеждане на текст“, която е показана по-долу:

Нормална ситуация, черната вертикална линия се показва.

След като пренапише стила, потребителят не може да види черната вертикална линия:

и xaml кода:

 <Style x:Key="PhoneTextBoxStyle" TargetType="toolkit:PhoneTextBox">
        <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/>
        <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="BorderBrush" Value="White"/>
        <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/>
        <Setter Property="SelectionForeground" Value="White"/>
        <Setter Property="BorderThickness" Value="2"/>
        <Setter Property="Padding" Value="{StaticResource PhoneBorderThickness}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="toolkit:PhoneTextBox">
                    <Grid x:Name="RootGrid" Background="Transparent">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Disabled">
                                </VisualState>
                                <VisualState x:Name="Enabled">
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="FocusStates">
                                <VisualState x:Name="Focused">
                                </VisualState>
                                <VisualState x:Name="Unfocused"/>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="LengthIndicatorStates">
                                <VisualState x:Name="LengthIndicatorVisible">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Visible</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0, 0, 0, 27"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0.6"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimation Duration="0:0:0.350" To="32" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.Y)" Storyboard.TargetName="LengthIndicator">
                                            <DoubleAnimation.EasingFunction>
                                                <ExponentialEase Exponent="6"/>
                                            </DoubleAnimation.EasingFunction>
                                        </DoubleAnimation>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="LengthIndicatorHidden">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0:0:0.350" To="0" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.Y)" Storyboard.TargetName="LengthIndicator">
                                            <DoubleAnimation.EasingFunction>
                                                <ExponentialEase Exponent="6"/>
                                            </DoubleAnimation.EasingFunction>
                                        </DoubleAnimation>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="RootGrid">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0, 0, 0, 0"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0.350" Value="0"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LengthIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0:0:0.350">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Collapsed</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="LengthIndicatorBorder">
                            <TextBlock x:Name="LengthIndicator" Foreground="{StaticResource PhoneContrastBackgroundBrush}" FontSize="{StaticResource PhoneFontSizeNormal}" HorizontalAlignment="Right" Margin="0" Opacity="0" TextAlignment="Right" VerticalAlignment="Bottom">
                                    <TextBlock.RenderTransform>
                                        <TranslateTransform/>
                                    </TextBlock.RenderTransform>
                            </TextBlock>
                        </Border>
                        <Border x:Name="HintBorder" BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}" 
                                Background="{TemplateBinding Background}" Margin="0">
                            <Grid>
                                <ContentControl x:Name="HintContent" Background="Transparent" Content="{TemplateBinding Hint}"
                                                HorizontalAlignment="Left" Margin="3,5,3,0" Style="{TemplateBinding HintStyle}" 
                                                Foreground="Gray"
                                                Visibility="{TemplateBinding ActualHintVisibility}" VerticalAlignment="Top"/>
                                <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" 
                                                Margin="{StaticResource PhoneTextBoxInnerMargin}" 
                                                Padding="{TemplateBinding Padding}"
                                                VerticalContentAlignment="Stretch"/>
                            </Grid>
                        </Border>
                        <Border x:Name="TextBorder" BorderBrush="White" 
                                BorderThickness="{TemplateBinding BorderThickness}" 
                                Background="Transparent" Margin="0" Visibility="Collapsed">
                            <TextBox x:Name="Text" Foreground="White" 
                                     FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" 
                                     FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}"
                                     HorizontalAlignment="Left" SelectionForeground="{TemplateBinding SelectionForeground}" 
                                     SelectionBackground="{TemplateBinding SelectionBackground}" 
                                     TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" 
                                     Text="{TemplateBinding Text}"/>
                        </Border>
                        <Border x:Name="ActionIconBorder" Background="Transparent" HorizontalAlignment="Right" Height="54" VerticalAlignment="Bottom" Width="54">
                            <Image x:Name="ActionIcon" Height="54" Source="{TemplateBinding ActionIcon}" Width="54"/>
                        </Border>
                        <TextBlock x:Name="MeasurementTextBlock" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsHitTestVisible="False" Margin="8" Opacity="0" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>