Cho mình hỏi sao Command DeleteStudent của mình không hoạt động vậy ạ?

XAML Code

<ListView ItemsSource="{Binding Students}">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Id" DisplayMemberBinding="{Binding Id}"/>
                    <GridViewColumn Header="Age" DisplayMemberBinding="{Binding Id}"/>
                    <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Id}"/>
                    <GridViewColumn>
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <Button Height="50" Content="Delete" Command="{Binding DeleteStudent}"/>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
</ListView>

ViewModel

 public partial class MainWindow : Window
    {
        public List<Student> Students { get; set; }

        ICommand DeleteStudent = new RelayCommand(o => { MessageBox.Show("DeleteStudents"); }, o => true);

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }
    }