To add an activity to the periodic sampling group
In the Navigator pane, right-click on the activity that you want to add to the group of activities that is periodically sampled.
Use the Ctrl or Shift key to select a group or range of activities, respectively.
Select the Add to Periodic Sampling Group command from the popup menu that is then displayed. This command is disabled if the activity is already included in the periodic sampling group or if the periodic sampling does not apply to that activity (for example, the Capture activity in the Node Sampling activity group).
The selected activity is then added to the periodic sampling group and highlighted in red in the Navigator pane.
To remove an activity from the periodic sampling group
In the Navigator pane, right-click on the activity that you want to remove from the group of activities that is periodically sampled.
Use the Ctrl or Shift key to select a group or range of activities, respectively.
Select the Remove from Periodic Sampling Group command from the popup menu that is then displayed.
This command is disabled if the activity is not included in the periodic sampling group or if the periodic sampling does not apply to that activity (for example, the Monitor Setup activity in the General activity group).
The selected activity is then removed from the periodic sampling group, the check mark or check marks are then removed from the activity or activities in the Periodically Sampled Items list on the Monitor Setup view of the General activity group, and the red highlighting is removed in the Navigator pane.