使用WPF MV-VM模式显示弹出窗口的正确方法

public class MainViewModel : ViewModelBase
{
    private bool _isPopupVisible;
    public bool IsPopupVisible
    {
        get { return _isPopupVisible; }
        set
        {
            _isPopupVisible = value;
            OnPropertyChanged("IsPopupVisible");
        }
    }
}

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
   <Window.Resources>
       <local:MainViewModel x:Key="MainViewModel" />
    </Window.Resources>
    <Grid>
       <Button Content="Show Popup" Command="{Binding ShowPopupCommand}" />
        <Popup IsOpen="{Binding IsPopupVisible, Source={StaticResource MainViewModel}}">
           <StackPanel>
                <TextBlock Text="This is a popup window" />
               <Button Content="Close" Command="{Binding ClosePopupCommand}" />
            </StackPanel>
        </Popup>
    </Grid>
</Window>

public class MainViewModel : ViewModelBase
{
    private bool _isPopupVisible;
    public bool IsPopupVisible
    {
        get { return _isPopupVisible; }
        set
        {
            _isPopupVisible = value;
            OnPropertyChanged("IsPopupVisible");
        }
    }

    public ICommand ShowPopupCommand { get; private set; }
    public ICommand ClosePopupCommand { get; private set; }

    public MainViewModel()
    {
        ShowPopupCommand = new RelayCommand(() => IsPopupVisible = true);
        ClosePopupCommand = new RelayCommand(() => IsPopupVisible = false);
    }
}