windows8xaml中的MessageDialog

我的代码：

            MessageDialog msg = new MessageDialog("Are you sure to cancel the booking?", "Confirmation");
            msg.Commands.Add(new UICommand("Confirm", new UICommandInvokedHandler(CommandHandler)));
            msg.Commands.Add(new UICommand("Cancel", new UICommandInvokedHandler(CommandHandler)));
            msg.DefaultCommandIndex = 1;
            msg.CancelCommandIndex = 1;
            await msg.ShowAsync();

private async void CommandHandler(IUICommand command)
    {
        var commandLabel = command.Label;
        switch (commandLabel)
        {
            case "Confirm":
                CancelBookingTickets();
                break;
            case "Cancel":
                break;

        }


    }

 protected async void CancelBookingTickets()
    {          

            MessageDialog msg1 = new MessageDialog("The cancellation process is complete", "Complete");
            await msg1.ShowAsync();            
    }

我试图在我的Windows 8 xaml应用程序中使用嵌套消息对话框，但当我到达

msg1.ShowAsync（）

，它会触发一个异常，说“访问被拒绝”

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有人能帮我解决这个问题吗？

您同时面临多个

消息对话框的问题