静态加载tree 问题

静态的加载tree,我已经设置好了节点。但是运行时tree却是空白的，高手看一下怎么回事。我不要动态的，就要静态的自己加就行。以下是tree的属性：
>? tv
{System.Windows.Forms.TreeView, Nodes.Count: 2, Nodes[0]: TreeNode: 节点2}
    base {System.Windows.Forms.Control}: {System.Windows.Forms.TreeView, Nodes.Count: 2, Nodes[0]: TreeNode: 节点2}
    BackColor: "{Name=Window, ARGB=(255, 255, 255, 255)}"
    BackgroundImage: null
    BackgroundImageLayout: Tile
    BorderStyle: Fixed3D
    borderStyle: Fixed3D
    CheckBoxes: true
    controlToolTipText: null
    CreateParams: {CreateParams {'SysTreeView32', '', 0x56011107, 0x200, {9, 16, 164, 484}}}
    DefaultSize: {Width = 121 Height = 97}
    DoubleBuffered: false
    downButton: None
    drawMode: OwnerDrawAll
    DrawMode: OwnerDrawAll
    editNode: null
    ForeColor: "{Name=WindowText, ARGB=(255, 0, 0, 0)}"
    FullRowSelect: true
    HideSelection: true
    hNodeMouseDown: 0
    HotTracking: false
    hoveredAlready: false
    ImageIndex: -1
    ImageIndexer: {System.Windows.Forms.ImageList.Indexer}
    imageIndexer: {System.Windows.Forms.ImageList.Indexer}
    ImageKey: ""
    imageList: null
    ImageList: null
    Indent: 19
    indent: -1
    internalStateImageList: null
    ItemHeight: 14
    itemHeight: -1