做下拉控件??
你添加一个Combo和一个Command控件。添加以下代码,就知道原理了。
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Const CB_SHOWDROPDOWN = &H14F
Dim nret&
Private Sub Form_Load()
Combo1.AddItem "11111"
Combo1.AddItem "22222"
Combo1.AddItem "33333"
Combo1.AddItem "44444"
Combo1.AddItem "55555"
Combo1.AddItem "66666"
nret = SendMessage(Combo1.hwnd, CB_SHOWDROPDOWN, 1, ByVal 0&)
End Sub