标题：[目录树]如何实现所有子节点的复选框未选，父节点的复选框也变成未选！

设置AfterCheckNode事件:

If e.node.Nodes.count > 0 Then
    Dim cnt As Integer
    For Each nd As WinForm.TreeNode In e.node.Nodes
        If nd.Checked Then
            cnt = cnt + 1
        End If
    Next
    If cnt = 0 Then
        e.node.Checked = False
    End If
End If
Dim pd As WinForm.TreeNode = e.Node.ParentNode
If pd IsNot Nothing Then
    Dim cnt As Integer
    For Each nd As WinForm.TreeNode In pd.Nodes
        If nd.Checked Then
            cnt = cnt +1
        End If
    Next
    If cnt = 0 Then
        pd.Checked = False
    End If
End If