TreeView 中 MVVM Command Binding

<HierarchicalDataTemplate x:Key="TreeNodes" ItemsSource="{Binding Path=Childs,Mode=OneWay}" >
                <StackPanel Orientation="Horizontal" Height="24" DataContext="{Binding}">
                    <TextBlock Text="{Binding Name}" VerticalAlignment="Center" FontSize="12" >
                        <i:Interaction.Triggers>
						<i:EventTrigger EventName="MouseLeftButtonUp">
                            <i:InvokeCommandAction Command="{Binding SelectCommand}"
                                                    CommandParameter="{Binding Id}"/>
                        </i:EventTrigger>
					</i:Interaction.Triggers>
                    </TextBlock>
                </StackPanel>

　　按照button中binding 的方式書寫TreeView中的綁定，实际运行中将会没有想过，原因是TreeView中Command默认绑定的是TreeView的DataContext,实际只需要制定正确的Command的源即可。

<HierarchicalDataTemplate x:Key="TreeNodes" ItemsSource="{Binding Path=Childs,Mode=OneWay}" >
                <StackPanel Orientation="Horizontal" Height="24" DataContext="{Binding}">
                    <TextBlock Text="{Binding Name}" VerticalAlignment="Center" FontSize="12" >
                        <i:Interaction.Triggers>
						<i:EventTrigger EventName="MouseLeftButtonUp">
                            <i:InvokeCommandAction Command="{Binding Path=DataContext.SelectCommand,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Page}}}"
                                                    CommandParameter="{Binding Id}"/>
                        </i:EventTrigger>
					</i:Interaction.Triggers>
                    </TextBlock>
                </StackPanel>