Disable vs. Notify

Fig 1

 

Better to keep ‘Add’ enabled and say ‘Bookmark can not contain spaces in its name’ when ‘Add’ button pressed.

‘Cut’ is disabled in MS Word menu when nothing selected and it is logical. Here it is not logical as you have to open help to figure out why you can not create a ‘Bookmark’.

‘Add’ button becomes disabled as soon you type first . No clues are left by MS Word.