例子中的《菜单权限》窗口点击应用时，显示《未将对象引用设置到对象的实例。》，错误所在位置代码如下，求帮助

        For Each itm As RibbonMenu.RibbonItem In grp.Items
            If tv.Nodes("功能区").Nodes(rtb.Name).Nodes(grp.Name).Nodes.Contains(itm.Name) = False Then
                 tv.Nodes("功能区").Nodes(rtb.Name).Nodes(grp.Name).Nodes.Add(itm.Name)
            End If
        Next
    Next
Next

\'快速访问兰
Dim tv9 As WinForm.TreeView = e.Form.Controls("菜单权限")
tv9.Nodes.Add("快速访问栏")
For Each itm9 As object In QAT.Items
    Dim nd9 As object = tv9.Nodes("快速访问栏").Nodes.Add(itm9.Name)
    If itm9.Gettype.name <> "Button"   Then
       If  itm9.Gettype.name <> "Separator"  Then     
        For Each citm As object In itm9.items
             Dim cnd As object = nd9.Nodes.Add(citm.Name)
            If citm.Gettype.name <> "Button" Then  
                      If  citm.Gettype.name <> "Separator"  Then     
                For Each ccitm As RibbonMenu.RibbonItem In citm.items
                    Dim ccnd As object = cnd.Nodes.Add(ccitm.Name)
                Next
              End If
            End If   
        Next
     End If
    End If
Next
\'配置兰
tv9.Nodes.Add("配置栏")
For Each itm9 As object In ConfigBar.Items
    Dim nd9 As object = tv9.Nodes("配置栏").Nodes.Add(itm9.Name)
    If itm9.Gettype.name <> "Button"   Then
       If  itm9.Gettype.name <> "Separator"  Then     
        For Each citm As object In itm9.items
             Dim cnd As object = nd9.Nodes.Add(citm.Name)
            If citm.Gettype.name <> "Button" Then  
                      If  citm.Gettype.name <> "Separator"  Then     
                For Each ccitm As RibbonMenu.RibbonItem In citm.items
                    Dim ccnd As object = cnd.Nodes.Add(ccitm.Name)
                Next
              End If
            End If   
        Next
     End If
    End If
Next
Dim trv8 As WinForm.TreeView = e.Form.Controls("菜单权限")
For Each nd8 As WinForm.TreeNode In tv.AllNodes
    If nd8.Text.IndexOf("分割条") >= 0 Then
       nd8.Delete()
    End If
Next

e.Form.Controls("菜单权限").Enabled = False

  e.Form.Controls("Btn菜单授权保存").Enabled = False
  e.Form.Controls("Btn菜单授权清除").Enabled = False
  e.Form.Controls("Btn菜单授权编辑").Enabled = False
    e.Form.Controls("提示1").Text = "请选择用户!!!"

下载信息  [文件大小：   下载次数： ]

点击浏览该文件:管理系统.foxdb

BIN版，按你的方法，调试了下，对例子中的权限窗口，仍然提示未《未将对象引用设置到对象的实例。》，

错误行从这里开始

Dim trv1 As WinForm.TreeView = e.Form.Controls("用户列表")
For Each u As UserInfo In Users
    If u.Type = UserTypeEnum.User Then \'排除管理员和开发者
        If trv1.Nodes.Contains(u.Group) = False Then
            trv1.Nodes.Add(u.Group)
        End If
        trv1.Nodes(u.Group).Nodes.Add(u.Name)
    End If
Next
\'功能区（前面执行没问题，错误从这里开始），是我定义不正确吗
Dim tv As WinForm.TreeView = e.Form.Controls("菜单权限")
tv.Nodes.Clear
tv.Nodes.Add("功能区")