Flex :: Label Does Not Render The String "0"?

I was writing a custom chart component where. To add labels, I create a spark label and add it on screen. Although all other labels rendered, I noticed that the zero label does not render at all. Here's my code:

var invisibleTextField:TextField = new TextField();
var zeroLabel:spark.components.Label = new spark.components.Label();
zeroLabel.text = "0";
zeroLabel.name = "0Label";

[code]....

After multiple attempts, I figure that the label discards "0" as an empty string. I managed to workaround using spaces before and after the zero. Only one space would also do, but I needed center aligning.