WPF tooltip 根据父元素属性决定是否显示

例如：Placement为disable的时候，需要显示一段tooltip, 而当Placement为enable的时候，不显示

<Button Grid.Row="2" x:Name="btnNewFolder" Style="{StaticResource NewFolderButtonStyle}" Margin="24,10,0,10" Click="btnNewFolder_Click" Visibility="{Binding IsShowFileTreeNewFolderButton,Converter={StaticResource visiblityConverter}}" ToolTipService.ShowOnDisabled="True">
            <Button.ToolTip>
                <ToolTip Content="{StaticResource IDS_CREATE_FOLDER_TIPS}" >
                    <ToolTip.Style>
                        <Style TargetType="{x:Type ToolTip}" BasedOn="{StaticResource NormalTooltipStyle}">
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding Path=PlacementTarget.IsEnabled, RelativeSource={RelativeSource Self}}" Value="True">
                                    <Setter Property="Visibility" Value="Collapsed"/>
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </ToolTip.Style>
                </ToolTip>
            </Button.ToolTip>
        </Button>