Color coding the X axis labels in a Bar or Line chart

Hi,
I have seen many posts about changing a chart's point or points based on values of the X axis but I have a different issue:
I want to color code the X axis labels based on either the label itself (a text, not a number) or a cell I can look up.
I can get to the XValue label itself using the .SeriesCollection.XValues (index) and thus can do a test
But I cannot find a way to set the label color. I saw something about using .Datalabels.Font.Color but that fails (cannot find the count property of the DataLabels class, and when I add an index to DataLabels, I get the same error
I use Excel 2010.
Code is below

Please Login or Register  to view this content.

I cannot just change the color of the bar because one of my charts is a stacked-bar charts with multiple colors already. Changing the x-axis label color is the best visual method I can think of
Thanks in advance
Olivier