Hi ivanpeevski, thank you for your answer. The problem is that I need to apply different colors dynamically on each cell, which are based on some data that I calculate at runtime. Is there a way to retrieve the current cell in the resourceTimelineFormatFunction (or somewhere else) and change its style? I just need to add the yellow color since the green and red cells are correctly rendered at the moment using the standard behaviour of the library with resourceTimelineMode set to diagram.