If you are using openflashchart with symfony, you have to add the following line to the function _ofc in open_flash_chart_object.php:
$out[] = ‘so.addParam(“wmode”, “transparent”);’;

…and embed the chart with true for $use_swfobject e.g.
stOfc::createChart(700, 300, ‘module/action’, true);

Regards
anothermike