Checked="chkVertical_Checked" Unchecked="chkVertical_Unchecked"> Use Vertical Orientation
//File:Window.xaml.vb Imports System Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Shapes Namespace LayoutPanels Public Partial Class SimpleStack Inherits Window Public Sub New() InitializeComponent() End Sub Private Sub chkVertical_Checked(sender As Object, e As RoutedEventArgs) stackPanel1.Orientation = Orientation.Horizontal End Sub Private Sub chkVertical_Unchecked(sender As Object, e As RoutedEventArgs) stackPanel1.Orientation = Orientation.Vertical End Sub End Class End Namespace