我有一个 PopupBox，我想为其更改图标。目前它默认为 DotsVertical，我想将它设置为 DotsHorizo​​ntal

I have a PopupBox that I want to change the icon for. Currently it defaults to DotsVertical and I would like to have it as a DotsHorizontal

我正在为 WPF 应用程序使用 MaterialDesignInXAML。我有一个 PopupBox，我想为其更改图标。目前它默认为 DotsVertical，我想将其设置为 DotsHorizontal。

我尝试了以下但没有成功。

<materialDesign:PopupBox PlacementMode="BottomAndAlignRightEdges" StaysOpen="False">
    <materialDesign:PopupBox.Content>
        <materialDesign:PackIcon Kind="DotsHorizontal" />
    </materialDesign:PopupBox.Content>
    <StackPanel>
        <TextBlock Text="Test1" />
        <TextBlock Text="Test2" />
        <TextBlock Text="Test3" />
    </StackPanel>
</materialDesign:PopupBox>

提前致谢！

弄明白了，我会在这里留下答案，以防其他人遇到这个问题。有个叫ToggleContent

的属性 
<materialDesign:PopupBox PlacementMode="BottomAndAlignRightEdges" StaysOpen="False">
    <materialDesign:PopupBox.ToggleContent>
        <materialDesign:PackIcon Kind="DotsHorizontal" />
    </materialDesign:PopupBox.ToggleContent>
    <StackPanel>
        <TextBlock Text="Test1" />
        <TextBlock Text="Test2" />
        <TextBlock Text="Test3" />
    </StackPanel>
</materialDesign:PopupBox>

要更改图标并保留当前样式，请使用：

<materialDesign:PopupBox PlacementMode="BottomAndAlignRightEdges" StaysOpen="False">
     <materialDesign:PopupBox.ToggleContent>
         <materialDesign:PackIcon Kind="DotsHorizontal" 
                                Foreground="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=materialDesign:PopupBox}, Path=Foreground}"                        />
         </materialDesign:PopupBox.ToggleContent>
    <StackPanel>
        <TextBlock Text="Test1" />
        <TextBlock Text="Test2" />
        <TextBlock Text="Test3" />
    </StackPanel>
</materialDesign:PopupBox>