From what I can tell DayPilot should be able to do everything I might need, but learning how is the issue. Crawl before walking. Learning from TutorialScheduler c#. First steps: my list of Resources includes a tour "name" and a date range (start/end) for that tour. LoadResource() loads the Tours in the left column. Now I want to highlight the active dates for each. Capturing DayPilotNavigator1_BeforeCellRender I want to compare the cell date being rendered with the start/end dates and change the background color as appropriate. However, a) I do not know what cell date is being rendered and b) when I compare e.start to Today() and set background it does so only for the first row, not subsequent rows as I can see in the e.ResourceId.