To easily see where state chart execution is at any given moment, the following visual cues make it easy to see the active state and transition:
•Active states have a thicker border
•Active transitions are highlighted
If the active state changes frequently, you will want to run the simulation step by step to observe the currently active state or transition.
Visual debugging can be turned ON or OFF using the Highlight Active States During Execution parameter in the State Chart > Preferences dialog box.