Working with the Change Tracking tab
The Change Tracking tab allows you to work with Change Notes in your model.
On the Change Tracking tab, the drop-down list shows the active Change Note.
To make a Change Note active
Select the Change Note you want to make active from the drop-down list.
Alternatively:
Click the 
Set Active button, and from the Select Object dialog, select the Change Note you want to make active.
Set Active button, and from the Select Object dialog, select the Change Note you want to make active.To make no Change Notes active
Select None from the drop-down list.
To open the Property Pages of the active Change Note
Click the 
Properties button.
Properties button.