主题：[求助]请问：这段代码输入到什么地方运行，才能实现目录树

请问：这段代码输入到什么地方运行，才能实现目录树

Forms("窗口1").open
Dim tr As WinForm.TreeView
Dim nd,nd1,nd2 As WinForm.TreeNode
tr = Forms("窗口1").Controls("TreeView1")
tr.nodes.clear
For Each r As Row In Tables("国家").Rows
    nd = Tr.Nodes.Add(r("国名"))   '第一个表的产品名称
    For Each rr As Row In Tables("省").Rows
        If rr("id").Substring(0,3) = r("id") And rr("id").length > 3
            nd1 = nd.Nodes.Add(rr("省名"))   '第二个表的产品名称
        End If
        For Each rrr As Row In Tables("市").Rows
            If rr("id").Substring(0,3) = r("id") And rrr("id").Substring(0,6) = rr("id") And rrr("id").length > 6
                nd2 = nd1.Nodes.Add(rrr("市名"))    '第三个表的产品名称
            End If
        Next
    Next
Next