Scroll panel with images

Hi

I have added 3 images into a scrolling panel and then added a circle linked to a trigger on the first image, the issue is when you scroll to the second and third image the circle remains stationery and so is present on the second an d third image - how do you lock the circle just to the first image? I have included the demo file - this is not a question about triggers purely how get the circle to act accordingly - ultimately I want to have a circle on each image that remains "attached" to each one - thanks in anticipation