I cant make the xaxis labels bold by using DATALABELS object when i set the  slantLabels object to 1.

string xmlData = "<chart caption='Monthly Drug Costs' legendShadow='1' xAxisName='Drug Name' yAxisName='Average Cost for 30 Day Supply' labelDisplay='Rotate' slantLabels='1' showValues='0' numberPrefix='$'>";
string strStyles = "<styles><definition><style name='myHTMLFont' type='font' bold='1' /><style name='ToolTipStyle' type='font' font='Microsoft Sans Serif' color='000000' size='13' isHTML='1' underline='1' Bold='1' />" +
"</definition><application><apply toObject='TOOLTIP' styles='ToolTipStyle' /><apply toObject='yAxisName' styles='myHTMLFont' /><apply toObject='DATALABELS' styles='myHTMLFont' />" +
"</application></styles>";