[flexcoders] white box under backgroundImage for List component?

[gwangdesign]

Hi,

I am having a problem with using CSS to assign "backgroundImage" for my 
component which subclasses List. The problem is on the very bottom of the 
component there is always a solid while rectangle that I cannot get rid of. 
I'vetried the same CSS for a Box component and there is no such a while box on 
the background.

The background image is a png file with alpha channel and rounded corner.

Here is the style and the link:
http://maohao.com/blogs/wordpress/ListBackgroundImage/bin-release/TestComp.html
(right click to view the source. thanks!)

.box
                {
                        background-image: Embed(source="assets/contactbkg.png",
                                scaleGridTop="10", scaleGridBottom="101",
                scaleGridLeft="11", scaleGridRight="154");
                        background-size: "100%";
                        font-family: arialEmbedded;
                        drop-shadow-enabled: false;
                        color: #FFFFFF;
                        padding-left: 0;
                        padding-top: 0;
                        padding-right: 0;
                        padding-bottom: 0;
                }