XAML:在ComboBox项目突出显示时显示按钮

<ComboBox>
    <ComboBox.ItemContainerStyle>
        <Style TargetType="ComboBoxItem">
            <Style.Triggers>
                <Trigger Property="IsHighlighted" Value="True">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="ComboBoxItem">
                                <Grid>
                                    <Button Content="按钮内容" />
                                </Grid>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Trigger>
            </Style.Triggers>
        </Style>
    </ComboBox.ItemContainerStyle>
    <ComboBoxItem>项目1</ComboBoxItem>
    <ComboBoxItem>项目2</ComboBoxItem>
    <ComboBoxItem>项目3</ComboBoxItem>
</ComboBox>