WPF开发过程中遇到的小问题

1》在自定义控件时，如果想用到eventtrigger时，eventtrigger中的路由事件必须用该事件所在的类来修饰，否则访问不到该事件。例如：

<ToggleButton x:Name="PART_toggleButton"
                                          VerticalAlignment="Top"
                                          IsChecked="False"
                                          Style="{StaticResource ToggleButtonStyle}"
                                          HorizontalAlignment="Center">
                                <ToggleButton.Triggers>
                                    <EventTrigger RoutedEvent="ToggleButton.Checked" SourceName="PART_toggleButton">
                                        <BeginStoryboard>
                                            <Storyboard>
                                                <DoubleAnimation Storyboard.TargetName="PART_Listbox"
                                                                 Storyboard.TargetProperty="Height"
                                                                 Duration="0:0:1"
                                                                 To="100"
                                                                 FillBehavior="HoldEnd"/>
                                            </Storyboard>
                                        </BeginStoryboard>
                                    </EventTrigger>

                                    <EventTrigger RoutedEvent="ToggleButton.Unchecked" SourceName="PART_toggleButton">
                                        <BeginStoryboard>
                                            <Storyboard>
                                                <DoubleAnimation Storyboard.TargetName="PART_Listbox"
                                                                 Storyboard.TargetProperty="Height"
                                                                 Duration="0:0:1"
                                                                 To="0"
                                                                 FillBehavior="HoldEnd"/>
                                            </Storyboard>
                                        </BeginStoryboard>
                                    </EventTrigger>
                                </ToggleButton.Triggers>
                            </ToggleButton>

　　这里面如果直接写

RoutedEvent="Unchecked" 会把错，说找不到

Unchecked路由事件。