A simple GUI script made with AutoIt (derived from my C++ snippet) ready to compile and run. This script was made to be assigned to a hot key or short cut.

#include <GUIConstantsEx.au3>

$drives = DriveGetDrive("CDROM")
If Not @error Then
    CDTray("" & $drives[1], "open")
    $driveopen = $drives[1]
    Opt("GUIOnEventMode", 1)
    $mwin = GUICreate("CD Tray", 340, 80)
    GUISetOnEvent($GUI_EVENT_CLOSE, "CloseIt")
    GUICtrlCreateLabel("CD Drive '" & $driveopen & "' is now open. Please place/remove disk and click OK.", 10, 10)
    $okb = GUICtrlCreateButton("OK", 125, 45, 80, 23)
    GUICtrlSetOnEvent($okb, "CloseIt")
    GUISetState(@SW_SHOW)
EndIf

While 1
    Sleep(1000)
WEnd

Func CloseIt()
    CDTray("" & $drives[1], "close")
    Exit
EndFunc