本文給出在VB中改變TreeView 的背景顏色的方法，主要使用了API函數。

Private Declare Function SendMessage Lib "User32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long

Private Declare Function GetWindowLong Lib "User32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long

Private Declare Function SetWindowLong Lib "User32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private Const GWL_STYLE = -16&
Private Const TVM_SETBKCOLOR = 4381&
Private Const TVM_GETBKCOLOR = 4383&
Private Const TVS_HASLINES = 2&

Dim frmlastForm As Form

Private Sub Form_Load()
Dim nodX As Node
Set nodX = TreeView1.Nodes.Add(, , "R", "Root")
Set nodX = TreeView1.Nodes.Add("R", tvwChild, "C1", "Child 1")
Set nodX = TreeView1.Nodes.Add("R", tvwChild, "C2", "Child 2")
Set nodX = TreeView1.Nodes.Add("R", tvwChild, "C3", "Child 3")
Set nodX = TreeView1.Nodes.Add("R", tvwChild, "C4", "Child 4")
nodX.EnsureVisible
TreeView1.style = tvwTreelinesText ' Style 4.
TreeView1.BorderStyle = vbFixedSingle
End Sub

Private Sub Command1_Click()
Dim lngStyle As Long
Call SendMessage(TreeView1.hWnd, TVM_SETBKCOLOR, 0, ByVal RGB(255, 0, 0))
'改變背景到紅色

lngStyle = GetWindowLong(TreeView1.hWnd, GWL_STYLE)
Call SetWindowLong(TreeView1.hWnd, GWL_STYLE, lngStyle - TVS_HASLINES)
Call SetWindowLong(TreeView1.hWnd, GWL_STYLE, lngStyle)
End Sub

Option Explicit

Private Declare Function SendMessage Lib "User32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long
Private Declare Function GetWindowLong Lib "User32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "User32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private Const GWL_STYLE = -16&

Private Const TVM_SETBKCOLOR = 4381&
Private Const TVM_GETBKCOLOR = 4383&
Private Const TVS_HASLINES = 2&

Private Sub Form_Load()
Dim nodex As Node
Dim i As Integer
Dim lStyle As Long

Call SendMessage(TreeView1.hWnd, TVM_SETBKCOLOR, 0, ByVal RGB(255, 0, 0))
lStyle = GetWindowLong(TreeView1.hWnd, GWL_STYLE)
Call SetWindowLong(TreeView1.hWnd, GWL_STYLE, lStyle - TVS_HASLINES)
Call SetWindowLong(TreeView1.hWnd, GWL_STYLE, lStyle)

TreeView1.Style = tvwTreelinesPlusMinusPictureText

TreeView1.BorderStyle = ccFixedSingle
With TreeView1.Nodes
Set nodex = .Add(, , "R", "Root")
nodex.BackColor = RGB(255, 0, 0)
For i = 1 To 10
Set nodex = .Add("R", tvwChild, "C" & i, "Child " & i)
nodex.BackColor = RGB(255, 0, 0)
nodex.EnsureVisible
Next
End With
End Sub