WPF VB.Net

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="BookApp" Height="300" Width="300">
    
              VerticalAlignment="Top" 
        HorizontalAlignment="Stretch" 
        Grid.Column="0" 
        Grid.ColumnSpan="1" 
        Grid.Row="0" 
        Grid.RowSpan="1"
        Name="btnGo">Go
    


//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes
Namespace BookApp
  Public Partial Class Window1
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()
      Dim x As New Book()
      x.author = "Author"
      x.title = "Title"
      x.price = CDec(9.99)
      Application.Current.Properties("Book") = x
    End Sub
    Private Sub MyClickEvent(sender As Object, e As RoutedEventArgs)
      Dim y As Book = DirectCast(Application.Current.Properties("Book"), Book)
      MessageBox.Show(y.title, y.author, MessageBoxButton.OK, MessageBoxImage.Hand)
    End Sub
  End Class
  Public Class Book
    Public price As Decimal
    Public title As String
    Public author As String
  End Class
End Namespace