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This code shows a simple way of 'hooking' modal windows (MsgBox or InputBox) and changing their behavior.

'PUT BELOW DECLARATIONS IN A .BAS MODULE
 
Option Explicit
 
Private Declare Function FindWindow Lib "user32" Alias _
   "FindWindowA" (ByVal lpClassName As String, _
   ByVal lpWindowName As String) As Long
 
Private Declare Function FindWindowEx Lib "user32" Alias _
  "FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, _
   ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
   
Public Declare Function SetTimer& Lib "user32" _
  (ByVal hwnd&, ByVal nIDEvent&, ByVal uElapse&, ByVal _
   lpTimerFunc&)
 
Private Declare Function KillTimer& Lib "user32" _
  (ByVal hwnd&, ByVal nIDEvent&)
 
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 EM_SETPASSWORDCHAR = &HCC
Public Const NV_INPUTBOX As Long = &H5000&
 
Public Sub TimerProc(ByVal hwnd&, ByVal uMsg&, _
   ByVal idEvent&, ByVal dwTime&)
 
    Dim EditHwnd As Long
 
' CHANGE APP.TITLE TO YOUR INPUT BOX TITLE.
 
    EditHwnd = FindWindowEx(FindWindow("#32770", App.Title), _
       0, "Edit", "")
 
    Call SendMessage(EditHwnd, EM_SETPASSWORDCHAR, Asc("*"), 0)
    KillTimer hwnd, idEvent
End Sub
 
'THIS IS HOW TO USE THE CODE FROM WITHIN A FORM
 
Private Sub Command1_Click()
  Dim ret As String
  SetTimer hwnd, NV_INPUTBOX, 10, AddressOf TimerProc
  ret = InputBox("Enter Password")
End Sub