Hide/Show_Password

#RequireAdmin
#include <GUIConstantsEx.au3>
#include <EditConstants.au3>
$hGUI = GUICreate("Test", 200, 120)
$cInput = GUICtrlCreateInput("Password", 32, 8, 145, 21, BitOR($GUI_SS_DEFAULT_INPUT,$ES_PASSWORD, $ES_AUTOHSCROLL))
$sShow = GUICtrlCreateCheckbox("Show pass", 32, 40, 121, 17)
GUICtrlSetState($sShow, $GUI_FOCUS)
GUISetState()

Global $sDefPasswordChar = GUICtrlSendMsg($cInput, $EM_GETPASSWORDCHAR, 0, 0)

While 1
    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE
            Exit
        Case $sShow
            Switch GUICtrlRead($sShow)
                Case 1
                    GUICtrlSendMsg($cInput, $EM_SETPASSWORDCHAR, 0, 0)
                Case 4
                    GUICtrlSendMsg($cInput, $EM_SETPASSWORDCHAR, $sDefPasswordChar, 0)
            EndSwitch
            GUICtrlSetState($cInput, $GUI_FOCUS)
            GUICtrlSetState($sShow, $GUI_FOCUS)
    EndSwitch

WEnd