When creating a Sparkline_Bar graph (v 1.2) If you
declare a custom color as #000000, and then use this
color for data points, the data points will not display.
$graph->setData($key, $value, 'fgColor');
The background shows up, but not the data points. Data
points with any other color I've tried show up - even
when mixed in the same graph as those not showing up.