[flexcoders] how to change the line's color??

[luoxuanhuayelin]

     In a  linechart, if  the   backgroundColor of  Application  is  not
"#ffffff",there will be  some  white horizontal lines in  the linechart.
how to change the line's color??  thanks

link to  a  snapshot of  my linechart
<http://bbs.blueidea.com/attachment.php?aid=80668&noupdate=yes>