列表框SelectionMode在WPF中不起作用

Question

我有ListBox，其中包含一些项目。我想实现：

1）按CTRL键选择不同的项目。

2）用于更改项目的Tab键。

3）Shift +标签控件..

• 我正在使用SelectionMode=Extended，但是CTRL不起作用，为什么？

• 当我按Tab键时，它只会切换第一项，为什么？

的Xaml：

 <Window.Resources>
    <Style x:Key="ButtonStyle2" TargetType="{x:Type CheckBox}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type CheckBox}">
                    <Canvas>
                        <Path x:Name="path" Data="{Binding PathCoords}" Margin="{Binding Margin}" Fill="#FFF4F4F5" Stretch="Fill" Stroke="Black"/>
                    </Canvas>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsFocused" Value="True">
                            <Setter Property="Stroke" TargetName="path" Value="#FFCF2222"/>
                            <Setter Property="StrokeThickness" TargetName="path" Value="2"/>
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True"/>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>
    <ListBox ItemsSource="{Binding Items}" SelectionMode="Extended">
        <ListBox.ItemsPanel>
            <ItemsPanelTemplate>
                <Canvas></Canvas>
            </ItemsPanelTemplate>
        </ListBox.ItemsPanel>   
        <ListBox.ItemTemplate>
            <DataTemplate>
                <CheckBox Style="{DynamicResource ButtonStyle2}" Focusable="True"></CheckBox>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

代码：

namespace WpfApplication13
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        DataContext = new Data();
        InitializeComponent();
    }
}
public class Element
{
    public string PathCoords { get; set; }
    public string Margin { get; set; }
    public int id { get; set; }
}
public class Data
{
    public List<Element> Items { get; set; }
    public Data()
    {
        Items = new List<Element>();
        Items.Add(new Element { PathCoords = "M52,92L89.5,57.5 99.5,100.5z" });
        Items.Add(new Element { PathCoords = "M131,104L150.5,39.5 204.5,87.5 155.5,88.5z" ,Margin="131,39.5,0,0"});
        Items.Add(new Element { PathCoords = "M232,105L231.5,49.5 294.5,49.5 291.5,97.5z", Margin = "231.5,49.5,0,0" });
        Items.Add(new Element { PathCoords = "M75,183L85.5,154.5 107.5,185.5z", Margin = "75,154.5,0,0" });
        Items.Add(new Element { PathCoords = "M167,222L166.5,169.5 230.5,190.5z", Margin = "166.5,169.5,0,0" });
        Items.Add(new Element { PathCoords = "M258,199L273.5,146.5 332.5,161.5 327.5,207.5z", Margin = "258,146.5,0,0" });
    }
}
}