Add a Day counter to a CategoryChart object?

[sandhya212]

Hi, I currently use CategoryChart to build histograms that get updated at every time point. In the end, I output a .gif file where I get to see all the histograms built across all the time points. Attached is an example .gif for number of cells (y-axis) against their state (x-axis: down or up) over 30 days. What I would like to have is a day counter from day 1 to day 30 on this histogram. Is there a way to do this on a CategoryChart object? Or if there is another way to have just the day counter i.e. not on the histogram, that will work too. Please advice.