Depending on your version of Word, comments have been
combined with track changes, and thus use balloons for the
most obvious comment view (Tools, options, track changes
tab). The showtip method just allows the user to light up
a comment when the user rolls the mouse over it = not very
useful.
Programically, you need something like the following:
ActiveWindow.View.RevisionsMode = wdBalloonRevisions
ActiveDocument.ActiveWindow.View.ShowHiddenText = True
ActiveDocument.Comments.ShowBy = "All Reviewers"
ActiveWindow.View.ShowComments = True
However, I have not been able to get "All Reviewers" to
work - had to set it manually through the reviewing
toolbar under the "Show" drop down menu. I believe All
Reviewers is the default, though.
To toggle the comments off, then you need:
ActiveWindow.View.ShowComments = False