Marking data in a stacked bar chart

[rdalton]

I have a stacked bar chart and i want to mark individual instances within a series, without marking the whole series. For example, I have one column with 3 series with counts 3, 4, and 5. I want to put a dot (or any other symbol) on 1 individual in the '3' series, 2 individuals in the '4' series, and 1 individual in the '5' series. I can't find a way to do this w/o marking the whole series in the column.