For vertical lines on the Gantt:
On the Gantt portion of the Program (so NOT on the WBS side) click on the date on the timeline and a Marker dialog box will open. Make sure you have View-->Show Markers turned on. Bad thing is that they are only visible to you. If you have other users of the same program they won't see the markers you've created. kind of a bummer.
for Milestone tasks:
click on the WBS task, click on the ellipse, change Task Type to milestone (everyone sees those)
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