Once you have displayed a chart with UA, you can use a grid to add vertical lines to your chart. Many people feel these improve the visibility to the passage time and relationship to studies. Right-click your mouse and click "X Grid" to bring up the following options:
None - Normal chart with no grid lines
Points - Dotted Vertical lines
Lines - Solid Vertical lines
Regions - Shaded Vertical regions
This feature may be combined with the Y Grid option, also on the right-click menu.