I need to add an alerter to a chart to highlight the week a product is on promotion. The chart is by week. I have a layout above that shows the data for the product by week and the weeks the product is on promotion are highlighted. The layout is a master layout that drives the chart below. When the user selects a product the chart below represents the data in a week over week layout. I want to be able to somehow highlight the week the product is on promotion in the chart, so it matches the layout making it easier for the user to evaluation the weeks the product was and was not on promotion.
I have tried applying alerter to the chart but it just highlights the entire back ground of the chart.