AxisRenderer canDropLabels isn't working

Question

I have a LineChart that had this code inside it:

<mx:AxisRenderer canDropLabels="true" labelRotation="0"/>

First all data inside this linechart where provided by a but now I get the data from a database via amf php the properties of the AxisRenderer that i have set aren't responding. The labels are very small (setting fontSize isn't working) and canDropLabels="true" is also refusing to work. Someone know how to fix this problem?