[flexcoders] Problem rotating line chart axis label using labelRotation and canDropLabels

[flexdev]

I have LineChart with large data, so I am using canDropLabels="true" for the 
horizontalAxis. I also want to rotate label using labelRotaion style. So it 
looks like:

<mx:horizontalAxisRenderers>
     <mx:AxisRenderer axis="{lineXLabel}" canDropLabels="true"
               labelRotation="45"/>
</mx:horizontalAxisRenderers>

I am using embed font for the LineChart and can rotate the label only 90 
degree. I also set the fontsize in the style to be 10. I am wondering if there 
is any known issue using both canDroptLabels="true" and labelRotation set other 
than 90. If I remove canDropLabels="true", then it will rotate all the labels 
but with invisibly tiny font.