The Conditions tab of the Event property sheet has the following components:
The event is triggered when the following system event occurs Executes the event when a circumstance or condition is met.
System event Select a system event that must occur to trigger the event.
And the following trigger conditions are true Set trigger conditions that must be satisfied, in addition to the system event, which trigger the event.
New Displays the Create Trigger Condition dialog, which lets you create a new trigger condition for the event.
Edit Displays the Edit Trigger Condition dialog, which lets you change an existing trigger condition.
Delete Removes the trigger condition from the list so that the event no longer executes based on that trigger condition.