StackPanel在增加控件的问题

今天遇到这样一个问题，就是我做了一个自定义控件。然后加到StackPanel中， 

<StackPanel Height="676" HorizontalAlignment="Left"       Name="stackPanel1"  Width="180"  Orientation="Vertical" >
</StackPanel>

　　　　WinUserInfo winUserInfo = new WinUserInfo();
           stackPanel1.Children.Add(winUserInfo);
            WinUserInfo winUserInfo1 = new WinUserInfo();
              stackPanel1.Children.Add(winUserInfo1);
              WinUserInfo winUserInfo2 = new WinUserInfo();
           stackPanel1.Children.Add(winUserInfo2);

如以上代码，无法得到垂直排列的效果。

解决方法就是要给控件设定高度和长度。

如下 

  WinUserInfo winUserInfo = new WinUserInfo();
            winUserInfo.Height = 220;
            winUserInfo.Width = 201;

            stackPanel1.Children.Add(winUserInfo);
            WinUserInfo winUserInfo1 = new WinUserInfo();
            winUserInfo1.Height = 220;
            winUserInfo1.Width = 201;
            stackPanel1.Children.Add(winUserInfo1);
             WinUserInfo winUserInfo2 = new WinUserInfo();
            winUserInfo2.Height = 220;
            winUserInfo2.Width = 201;
            stackPanel1.Children.Add(winUserInfo2);