ToggleButton中的值转换器在第三次尝试时不会触发

Question

我在ToggleButton中有一个值转换器，如下所示：

 <ToggleButton  Width="200" Height="30" HorizontalAlignment="Center" >
            <ToggleButton.Style>
                <Style TargetType="{x:Type ToggleButton}">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ToggleButton}">
                                <Grid x:Name="Chrome" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                                    <ContentPresenter Margin="{TemplateBinding Padding}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                                    <TextBlock Name="txtBlock"/>
                                </Grid>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsChecked" Value="True">
                                        <Setter Property="Content" >
                                            <Setter.Value>
                                                <MultiBinding Converter="{StaticResource DeleteRow}"/>
                                            </Setter.Value>
                                        </Setter>
                                    </Trigger>

                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </ToggleButton.Style>
        </ToggleButton>

值转换器当前为空，只有一个消息框，如下所示：

Imports System.Data
Imports System.Globalization

Public Class DeleteRow
    Implements IMultiValueConverter

    Public Function Convert(values() As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IMultiValueConverter.Convert
        MsgBox("Hello")

    End Function

    Public Function ConvertBack(value As Object, targetTypes() As Type, parameter As Object, culture As CultureInfo) As Object() Implements IMultiValueConverter.ConvertBack
        Throw New NotImplementedException()
    End Function
End Class

问题是转换器第一次触发时单击按钮。再次单击该按钮显然会将IsChecked设置为False。但是我希望当我第三次单击它的IsChecked状态为false时，它应该触发但不会触发。

有什么想法吗？