使用ReactiveUi命令显示Mahapps.Metro对话框时遇到问题

public void ShowDialog()
{
    Application.Current.Dispatcher.Invoke(() =>
    {
        var dialog = new CustomDialog();
        dialog.ShowDialog();
    });
}

<Window x:Class="YourNamespace.CustomDialog"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mah="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
        Title="CustomDialog" Height="300" Width="400">
    <mah:MetroWindow>
        <!-- Your content here -->
    </mah:MetroWindow>
</Window>

public class MainViewModel : ReactiveObject
{
    public ReactiveCommand<Unit, Unit> ShowDialogCommand { get; }

    public MainViewModel()
    {
        ShowDialogCommand = ReactiveCommand.CreateFromTask(async _ =>
        {
            await Task.Run(() => ShowDialog());
        });
    }

    private void ShowDialog()
    {
        Application.Current.Dispatcher.Invoke(() =>
        {
            var dialog = new CustomDialog();
            dialog.ShowDialog();
        });
    }
}

<Button Content="Show Dialog" Command="{Binding ShowDialogCommand}" />