如果我理解你的要求，我认为你可以得到答案，如果你看一下默认的扩展模板。您可以通过创建一个新的临时项目，在美工板上放置扩展器，然后在“对象”列表中右键单击它并创建模板副本来完成此操作。
您将看到Expander具有用于ExpandUp，ExpandDown，ExpandLeft和ExpandRight的VisualStates。对于不同的方向，每个状态都会将扩展器ToggleButton替换为上/下，左或右模板。每个方向也配置扩展器的网格将按钮和扩展器区域放在正确的位置。
您需要创建左右ToggleButton模板。这就是您可以设计箭头指向正确方向的地方。然后在扩展器的左侧和右侧VisualStates中，指向这些模板。
希望这是有道理的。我想如果你看看默认的模板，它应该很清楚，但是我已经做了一段时间了。我记得他们没有做所有的州，但。
这是我的SL示例。我们的应用程序只需要上下，所以没有左或右，但希望它可以让你开始。箭头旋转，所以你可以看到如何工作。
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"
xmlns:System="clr-namespace:System;assembly=mscorlib"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/BasicResources;component/BasicStyles.xaml"/>
<ResourceDictionary Source="/BasicResources;component/BasicResource.xaml"/>
</ResourceDictionary.MergedDictionaries>
<!-- Named fade brush for visual effect on Expander Header right edge -->
<!-- this brush is specified here as it uses resource brushes, so will work properly with high contrast -->
<LinearGradientBrush x:Key="ExpanderHeaderFadeBrush" StartPoint="0,0" EndPoint="1,0">
<GradientStop Color="Transparent"/>
<GradientStop Color="{StaticResource BgColor}" Offset="1"/>
</LinearGradientBrush>
<Style x:Key="ExpanderHeaderBorderStyle" TargetType="Border">
<Setter Property="BorderBrush" Value="{StaticResource BorderRestBrush}"/>
<Setter Property="BorderThickness" Value="0,0.5,0,0"/>
<Setter Property="VerticalAlignment" Value="Bottom"/>
<Setter Property="HorizontalAlignment" Value="Stretch"/>
<Setter Property="Background" Value="{StaticResource MouseDownBgBrush}"/>
</Style>
<ControlTemplate x:Key="ExpanderHeaderCT" TargetType="ContentControl">
<Border
x:Name="bdrControlFooter"
Style="{StaticResource ExpanderHeaderBorderStyle}"
Height="{TemplateBinding Height}">
<Border
x:Name="bdrTopInner"
BorderBrush="{StaticResource WhiteBrush}"
BorderThickness="0,1,0,0">
<ContentPresenter
Cursor="{TemplateBinding Cursor}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
Margin="{TemplateBinding Padding}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Border>
</Border>
</ControlTemplate>
<Style x:Key="ExpanderHeaderContentStyle" TargetType="ContentControl">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Setter Property="VerticalContentAlignment" Value="Top" />
<Setter Property="Height" Value="44" />
<Setter Property="Template" Value="{StaticResource ExpanderHeaderCT}" />
</Style>
<!-- down button template -->
<ControlTemplate x:Key="ExpanderDownHeaderTemplate" TargetType="ToggleButton">
<Grid Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CheckStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.1"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Checked">
<Storyboard>
<DoubleAnimation Duration="0" To="45" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="pathTwirly" />
</Storyboard>
</VisualState>
<VisualState x:Name="Unchecked"/>
<VisualState x:Name="Indeterminate"/>
</VisualStateGroup>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.3"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation Duration="0" To="{StaticResource OrangeColor}" FillBehavior="HoldEnd" Storyboard.TargetProperty="(TextBlock.Foreground).(SolidColorBrush.Color)" Storyboard.TargetName="header" />
<ColorAnimation Duration="0" To="{StaticResource OrangeColor}" FillBehavior="HoldEnd" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="pathTwirly" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
</VisualState>
<VisualState x:Name="Disabled"/>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="FocusVisualElement">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="58"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ContentControl x:Name="contentOuter"
Style="{StaticResource ExpanderHeaderContentStyle}"
VerticalContentAlignment="Stretch"
VerticalAlignment="Stretch"
Height="58">
<Grid x:Name="gInnerGrid"
Background="{StaticResource GradientHeaderBgBrush}" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Path x:Name="pathTwirly"
Data="F1 M 0.000,10.000 L 5.500,4.999 L 0.000,0.000 L 0.000,10.000 Z"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="35,0,0,0"
RenderTransformOrigin="0.5,0.5">
<Path.RenderTransform>
<CompositeTransform/>
</Path.RenderTransform>
<Path.Fill>
<SolidColorBrush x:Name="brushPathFill" Color="{StaticResource BlueColor}" />
</Path.Fill>
</Path>
<Rectangle x:Name="rectFade"
Grid.Column="1"
Width="75"
HorizontalAlignment="Right"
Fill="{StaticResource ExpanderHeaderFadeBrush}"/>
<TextBlock x:Name="header"
Text="{TemplateBinding Content}"
Style="{StaticResource BlueSmallHeadingText}"
Grid.Column="1"
HorizontalAlignment="Stretch"
Margin="4,0,0,0"
VerticalAlignment="Center">
<TextBlock.Foreground>
<SolidColorBrush x:Name="brushHeader" Color="{StaticResource BlueColor}"/>
</TextBlock.Foreground>
</TextBlock>
</Grid>
</ContentControl>
</Grid>
<!-- strokedasharray specified here .. silverlight bug that it won't pick up that style element. works fine in up! -->
<Rectangle x:Name="FocusVisualElement"
Style="{StaticResource LinkRectangleFocusStyle}"
IsHitTestVisible="false"
StrokeThickness="1"
StrokeDashArray="1,3"
Visibility="Collapsed"/>
</Grid>
</ControlTemplate>
<!-- up button template -->
<ControlTemplate x:Key="ExpanderUpHeaderTemplate" TargetType="ToggleButton">
<Grid Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CheckStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="00:00:0.1"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Checked">
<Storyboard>
<DoubleAnimation Duration="0" To="-45" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="pathTwirly" />
</Storyboard>
</VisualState>
<VisualState x:Name="Unchecked"/>
</VisualStateGroup>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0:0:0.3"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation Duration="0" To="{StaticResource OrangeColor}" Storyboard.TargetProperty="(TextBlock.Foreground).(SolidColorBrush.Color)" Storyboard.TargetName="header" />
<ColorAnimation Duration="0" To="{StaticResource OrangeColor}" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)" Storyboard.TargetName="pathTwirly" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed"/>
<VisualState x:Name="Disabled"/>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="FocusVisualElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="58"/>
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ContentControl x:Name="contentOuter"
Style="{StaticResource ExpanderHeaderContentStyle}"
VerticalContentAlignment="Stretch"
Height="58">
<Grid x:Name="gInnerGrid"
Background="{StaticResource GradientHeaderBgBrush}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Path x:Name="pathTwirly"
Data="F1 M 0.000,10.000 L 5.500,4.999 L 0.000,0.000 L 0.000,10.000 Z"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="35,0,0,0"
RenderTransformOrigin="0.5,0.5">
<Path.RenderTransform>
<CompositeTransform/>
</Path.RenderTransform>
<Path.Fill>
<SolidColorBrush x:Name="brushPathFill" Color="{StaticResource BlueColor}"/>
</Path.Fill>
</Path>
<Rectangle x:Name="rectFade"
Grid.Column="1"
Width="75"
HorizontalAlignment="Right"
Fill="{StaticResource ExpanderHeaderFadeBrush}"/>
<TextBlock x:Name="header"
Text="{TemplateBinding Content}"
Style="{StaticResource BlueSmallHeadingText}"
Grid.Column="1"
HorizontalAlignment="Stretch"
Margin="4,0,0,0"
VerticalAlignment="Center">
<TextBlock.Foreground>
<SolidColorBrush x:Name="brushHeader" Color="{StaticResource BlueColor}"/>
</TextBlock.Foreground>
</TextBlock>
</Grid>
</ContentControl>
</Grid>
<Rectangle x:Name="MouseOverBorderElement"
Style="{StaticResource RectangleMouseOverStyle}"
Grid.ColumnSpan="2"
Opacity="0"/>
<Rectangle x:Name="FocusVisualElement"
Style="{StaticResource LinkRectangleFocusStyle}"
IsHitTestVisible="false"
Visibility="Collapsed"/>
</Grid>
</ControlTemplate>
<!-- main expander template -->
<ControlTemplate x:Key="ExpanderCT" TargetType="toolkit:Expander">
<Grid Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal"/>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="DisabledVisualElement">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Pressed"/>
</VisualStateGroup>
<!-- focus comes from the expander togglebutton -->
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused"/>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
<VisualStateGroup x:Name="ExpansionStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="Collapsed"/>
<VisualState x:Name="Expanded">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ExpandDirectionStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0"/>
</VisualStateGroup.Transitions>
<VisualState x:Name="ExpandDown">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Height" Storyboard.TargetName="rd1">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Width" Storyboard.TargetName="cd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ExpandUp">
<Storyboard>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Template" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource ExpanderUpHeaderTemplate}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Row)" Storyboard.TargetName="ExpanderButton">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="(Grid.Row)" Storyboard.TargetName="ExpandSite">
<DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Height" Storyboard.TargetName="rd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Width" Storyboard.TargetName="cd0">
<DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ExpandLeft" />
<VisualState x:Name="ExpandRight" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<!-- begin layout -->
<Border x:Name="Background"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="cd0" Width="Auto"/>
<ColumnDefinition x:Name="cd1" Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition x:Name="rd0" Height="Auto"/>
<RowDefinition x:Name="rd1" Height="Auto"/>
</Grid.RowDefinitions>
<ToggleButton x:Name="ExpanderButton"
ContentTemplate="{TemplateBinding HeaderTemplate}"
Content="{TemplateBinding Header}"
Grid.Column="0"
Foreground="{TemplateBinding Foreground}"
FontWeight="{TemplateBinding FontWeight}"
FontStyle="{TemplateBinding FontStyle}"
FontStretch="{TemplateBinding FontStretch}"
FontSize="{TemplateBinding FontSize}"
FontFamily="{TemplateBinding FontFamily}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
IsChecked="{TemplateBinding IsExpanded}"
Margin="0"
MinWidth="0"
MinHeight="0"
Padding="{TemplateBinding Padding}"
Grid.Row="0"
Template="{StaticResource ExpanderDownHeaderTemplate}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
<ContentControl x:Name="ExpandSite"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
Grid.Column="0"
Foreground="{TemplateBinding Foreground}"
FontWeight="{TemplateBinding FontWeight}"
FontStyle="{TemplateBinding FontStyle}"
FontStretch="{TemplateBinding FontStretch}"
FontSize="{TemplateBinding FontSize}"
FontFamily="{TemplateBinding FontFamily}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
Margin="{TemplateBinding Padding}"
Grid.Row="1"
Visibility="Collapsed"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Grid>
</Border>
<Border x:Name="DisabledVisualElement"
Style="{StaticResource BorderDisabledStyle}"
IsHitTestVisible="false"
Visibility="Collapsed"/>
<Border x:Name="FocusVisualElement"
Style="{StaticResource BorderFocusStyle}"
IsHitTestVisible="false"
Visibility="Collapsed"/>
</Grid>
</ControlTemplate>
<!-- styles the expander header .. the top line and background color -->
<Style TargetType="toolkit:Expander">
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<Setter Property="Template" Value="{StaticResource ExpanderCT}"/>
</Style>
乍一看XAML中显示不正确。尽管你试图做的事听起来不难，但我在尝试想象你想要完成的事情时遇到了一些麻烦。如果你不介意做一个快速的肮脏的图画来展示你正在拍摄的东西，我可以告诉你如何完成它。 – 2012-01-12 15:02:40
@克里斯W.：我更新了我的问题。 – Terry 2012-01-12 15:16:54
好的抱歉，图像很小。为了确保我有这个正确的方向，你有4个箭头面向内，位于该线中心的圆形图案？你希望他们点击旋转四十五度，并在窗口的每个角落都面对NW，NE，SW，SE的位置，对吗？ – 2012-01-12 16:25:10