判断combobox控件列表被收起.frm

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VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "CBN_CLOSEUP消息范例程序"
   ClientHeight    =   2910
   ClientLeft      =   1650
   ClientTop       =   1530
   ClientWidth     =   4170
   LinkTopic       =   "Form1"
   ScaleHeight     =   2910
   ScaleWidth      =   4170
   Begin VB.ListBox List1 
      Height          =   2205
      ItemData        =   "判断ComboBox控件列表被收起.frx":0000
      Left            =   120
      List            =   "判断ComboBox控件列表被收起.frx":0002
      TabIndex        =   2
      Top             =   240
      Width           =   2415
   End
   Begin VB.ComboBox Combo2 
      Height          =   300
      ItemData        =   "判断ComboBox控件列表被收起.frx":0004
      Left            =   2760
      List            =   "判断ComboBox控件列表被收起.frx":0017
      TabIndex        =   1
      Text            =   "Combo2"
      Top             =   1080
      Width           =   1335
   End
   Begin VB.ComboBox Combo1 
      Height          =   300
      ItemData        =   "判断ComboBox控件列表被收起.frx":0043
      Left            =   2760
      List            =   "判断ComboBox控件列表被收起.frx":0056
      TabIndex        =   0
      Text            =   "Combo1"
      Top             =   240
      Width           =   1335
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub Combo1_DropDown()
    List1.AddItem "Combo1被拉下来了"
End Sub

Private Sub Combo2_DropDown()
    List1.AddItem "Combo2被拉下来了"
End Sub

Private Sub Form_Load()
    prevWndProc = GetWindowLong(Me.hWnd, GWL_WNDPROC)
    SetWindowLong Me.hWnd, GWL_WNDPROC, AddressOf WndProc
End Sub

Private Sub Form_Unload(Cancel As Integer)
    SetWindowLong Me.hWnd, GWL_WNDPROC, prevWndProc
End Sub