[flexcoders] How can I force the labels on my ColumSeries to remain vertical?

[sailorsea21]

Hi everyone, How can I force the labels on my ColumSeries to always 
remain vertical? At the moment, if the labels are short enough, they 
will remain horizontal. 

This is what I have in my code:
<mx:ColumnChart showLabelVertically="true" ...
<mx:ColumnSeries labelPosition="outside" ...

This is what I have in my CSS:
@font-face {
    src: local("Arial");
    font-family: EmbeddedArial;
}
ColumnSeries {
        font-family: EmbeddedArial;
}  

Thanks.