List box shows undefined after the items are displayed

Hi All,

I am facing a issue with a list box component. The dataprovider has just 5 entries and the list box is big enough that after displaying the 5 entries there is enough space left blank for future additions, but currently in the empty space the list box displays “undefined” text.

Can you please help me resolve this issue?

Please note that i have to use the flash MX comonent only as it is easy to skin.