public B2BDetailPage(string postId)
 {
     InitializeComponent();
     this.BindingContext = viewModel = new B2BDetailPageViewModel();
     viewModel.LoadPostById(postId);
     Init();
 }
 public B2BDetailPage(B2BPostItem postItem)
 {
     InitializeComponent();
     this.BindingContext = viewModel = new B2BDetailPageViewModel();
     viewModel.PostItem  = postItem;
     Init();
 }