To Regenerate the Style Feature
During Style regeneration, only the entities contained in the Style feature are regenerated and not the entire Creo model.
Click 
Style > 
Regenerate All to regenerate all Style features that are out of date.
Style > Regenerate All to regenerate all Style features that are out of date.The traffic light is green when the model is up to date, yellow when the model is out of date, and red when there has been a failed regeneration.