It looks like cornerradius is not working for the SWF10 runtime.
Tested with this code:
<canvas width="100%" height="800" debug="true">
<stylesheet>
note {
bgcolor: #fff070;
width: 180;
height: 220;
cornerradius: 50;
}
</stylesheet>
<class name="note" extends="view" width="$style{'width'}"
height="$style{'height'}" bgcolor="$style{'bgcolor'}"
cornerradius="$style{'cornerradius'}">
</class>
<note x="50" y="20" id="note1">
</note>
</canvas>
For SWF10, I just get a square with no radius applied. In the debugger
I see that the value is set on the view, and for the display object I
get
note1.getDisplayObject().cornerradius Array(4)#0| [50, '50', '50', '50']ยป
That code used to work with 4.7, I think.