How do I get
Private Sub UserForm_Activate()
Application.Wait Now + TimeValue("00:00:03")
Unload Me
Application.ScreenUpdating = False
Sheets("main").Select
Application.ScreenUpdating = True
End Sub

to function with:

SetWindowLong _
Lib "user32" _
Alias "SetWindowLongA" ( _
ByVal hwnd As Long, _
ByVal nIndex As Long, _
ByVal dwNewLong As Long) _
As Long
Private Declare Function FindWindow _
Lib "user32" _
Alias "FindWindowA" ( _
ByVal lpClassName As String, _
ByVal lpWindowName As String) _
As Long

Private Sub UserForm_Initialize()
SetWindowLong FindWindow(vbNullString, Me.Caption), _
-16, -2067791744
End Sub