How to add axis labels to line chart in popup for Flex

Hi,

I was wondering is it possible to add axis labels to a line chart in the pop ups for flex.
I want to add the years across the bottom because without using the mouse to hover over each figure in the graph users won't know what it means. I can foresee users complaining that the chart means nothing to them by just looking at it without labels.
Is this possible to do?
Many thanks

Rachel