Not able to open note extra row area in lyric editor

[andy840119]

In some states, we do not want to let users open note overlay in the lyric editor because this lyric is not ready to interact with notes.
.
And what's should be prepared for edit note:

• time-tags are ready.
• time-tags are locked(optional), add this is because we want users not to change the time-tag again after modified notes.

[andy840119]

Maybe should show the message in the overlay.

And might make such class into base class?
Something like "CreateInvalidContent?"
Or something like "GetInvalidMessage"