WPF MVVM - 在TreeViewItem中触发事件的最正确方法是什么

<swi:Interaction.Triggers>
    <swi:EventTrigger EventName="Click">
        <esi:CallDataMethod Method="SaveRevision_Clicked"/>
    </swi:EventTrigger>
</swi:Interaction.Triggers>

xmlns:esi="clr-namespace:Expression.Samples.Interactivity;assembly=Expression.Samples.Interactivity"
xmlns:swi="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

<Style x:Key="FolderView" TargetType="{x:Type TreeViewItem}">
    <Setter Property="HeaderTemplate">
        <Setter.Value>
            <HierarchicalDataTemplate ItemsSource="{Binding Children}"  >
                <StackPanel Orientation="Horizontal">
                    <Image Name="img"
                               Width="20"
                               Height="20"
                               Stretch="UniformToFill"
                               Source="Images/hdicon.png"/>
                    <TextBlock Text="{Binding FolderName}" Margin="5,0" />
                </StackPanel>
            </HierarchicalDataTemplate>
        </Setter.Value>
    </Setter>
</Style>

<swi:Interaction.Triggers>
    <swi:EventTrigger EventName="Expanded">
        <esi:CallDataMethod Method="Expand"/>
    </swi:EventTrigger>
</swi:Interaction.Triggers>