You no longer need to open a substitute part and use the context menu command Check for Updates to synchronize a substitute with the source assembly.
In this release, substitute parts no longer display a unique browser icon. When a substitute part is out of date, it displays the familiar update icon in the source assembly. You can choose to update the substitute part if desired, or open the part and break the link with the source to prevent updates.
For more information, see To Create Model States.