attach labels to secondary x-axis values

[ehamike]

i have a chart that combines an area chart with a scatter chart. I would like to place some labels on the secondary x axis. currently the values on the axis are 0%, 20%, 40%, etc going up as high as neccessary depending on the values being plotted.
There is an associated date that I can calculate to go with each of the %. I would like to be able to print the date right next to the %... like
0% - 10/01/09
20% - 10/15/09
40% - 11/3/09
etc
is this possible?

thx
mike