I couldn't view your chart snapshot, but it sounds like you are 
talking about the grid lines.  Put something similar to the following 
into your LineChart declaration.

    <mx:backgroundElements>
       <mx:GridLines direction="horizontal">
            <mx:horizontalFill>
                <mx:SolidColor color="0xFF0000" />
            </mx:horizontalFill>
        </mx:GridLines>
    </mx:backgroundElements>

Look at the GridLines class in the docs for more info.  The above is 
taken from the example there.

HTH,
Doug


--- In flexcoders@yahoogroups.com, "luoxuanhuayelin" 
<[EMAIL PROTECTED]> wrote:
>
> 
>      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>
>


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