如何将子级上的触发器设置为父级属性？

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如何将子级上的触发器设置为父级属性？

<ControlTemplate TargetType="ToggleButton">
                <Image Name="ExpanderImage" Height="24" Width="24" Source="..\Images\Icons\32x32\Blue\Open.png" />
                <ControlTemplate.Triggers>
                    <Trigger Property="IsChecked" Value="True">
                        <Setter TargetName="ExpanderImage" Property="Source" Value="..\Images\Icons\32x32\Blue\Close.png" />
                    </Trigger>
                    <DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource TemplatedParent}}" Value="True">
                        <Setter TargetName="ExpanderImage" Property="Source" Value="..\Images\Icons\32x32\Green\Open.png" />
                    </DataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsChecked, RelativeSource={RelativeSource Self}}" Value="True" />

如何将子级上的触发器设置为父级属性？

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