Using variables and across layers to control slide navigation with objects and markers By Jamie Thompson Hi there - I started with a slide containing 4 object triggers that require all 4 layers to be visited before activating the Next button: Base Layer - Change state of Next Button to Disabled when the timeline starts on this slide if ButtonsVisited = value False. Object triggers - Set ButtonsVisited to value True when the state of all pictures is Visited. I've now added markers on the layers that need to be visited as well before enabling the Next button. I've tried all kinds of combinations and can't get figure it out. Can someone assist me?