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
Private Const WM_LBUTTONDBLCLK = &H203
Private Sub Form_Load
sendMessage Me.Hwnd, WM_LBUTTONDBLCLK, 0&, 0&
End Sub