//File:Window.xaml.vb Imports System Imports System.Windows Imports System.Diagnostics Imports System.Windows.Shapes Imports System.Windows.Input Namespace WpfApplication1 Public Partial Class Window1 Inherits System.Windows.Window Public Sub New() InitializeComponent() End Sub Private Sub PreviewMouseDownButton(sender As Object, e As RoutedEventArgs) Debug.WriteLine("PreviewMouseDownButton") End Sub Private Sub MouseDownButton(sender As Object, e As RoutedEventArgs) Debug.WriteLine("MouseDownButton") End Sub End Class End Namespace