Wpf 为什么即使箭头仍在元素顶部，鼠标输入事件仍会触发鼠标左键？

我有MouseEnter和MouseLeave事件的组合框。当鼠标进入combobox时，它应该并且确实触发mouseEnter事件。将其不透明度从40%设置为100%。MouseLeave事件则相反。这里的问题是，当鼠标进入时，它触发鼠标进入事件，然后再次触发鼠标离开事件和鼠标进入事件。组合框将被设置为100%的不透明度。我怎样才能纠正这个错误

<ComboBox Name="PageNumberComboBox" Panel.ZIndex="10" Width="70" Grid.Row="1" Grid.Column="0" Height="40" VerticalAlignment="Top" HorizontalAlignment="Right" Margin="0,10,10,0" IsEditable="True" Opacity="0.4" MouseEnter="PageNumberComboBox_MouseEnter" MouseLeave="PageNumberComboBox_MouseLeave"></ComboBox>

---

哇，真管用，非常感谢！。虽然Firinge事件将是更好的选择。

<Grid Panel.ZIndex="0" Grid.Row="1" Grid.ColumnSpan="2" >

private void PageNumberComboBox_MouseEnter(object sender, MouseEventArgs e)
    {
        PageNumberComboBox.Opacity = 100.0;
        MessageBox.Show("mouse enter");
    }

    private void PageNumberComboBox_MouseLeave(object sender, MouseEventArgs e)
    {
        PageNumberComboBox.Opacity = 40.0;
        MessageBox.Show("mouse leave");
    }

    <ComboBox>
        <ComboBox.Style>
            <Style TargetType="ComboBox">
                <Setter Property="Opacity" Value="0.4"/>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=IsMouseOver}" Value="True">
                        <Setter Property="Opacity" Value="1"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ComboBox.Style>
    </ComboBox>