WPF stackpanel在dockpanel中的位置

通过setDock()来设置stackpanel在dockpanel位置（top,bottom,left,right）

                Dim dpanel As New DockPanel()        dpanel.Margin = New Thickness(0)        Dim spanel As New StackPanel()        Dim container As IAddChild = spanel        spanel.HorizontalAlignment = Windows.HorizontalAlignment.Right        spanel.Orientation = Orientation.Horizontal        DockPanel.SetDock(spanel, Dock.Bottom)        dpanel.Children.Add(spanel)        Dim btn2 As New Button()        Dim btn3 As New Button()        btn2.Content = "LOVE"        btn3.Content = "Me !"        btn2.Margin = New Thickness(0, 0, 0, 0)        btn3.Margin = New Thickness(0, 0, 0, 0)        container.AddChild(btn2)        container.AddChild(btn3)        container = Me        container.AddChild(dpanel)