I'm building an AIR app in Adobe Flex Builder 3, and I'm having a really strange issue. I'm using a Window component, and everything seemed to be working fine. The Window component is transparent and has an alpha. But all of a sudden, I noticed that the window always has a small square right in the center. I can't figure out what it is. If I make the window have to scroll vertically, it will be in the center of scrolling, so it is always in the center of the content of the window.
I've attached a screenshot to this post, and you can see the little square just to the left of the checkbox.
Anyway, does anyone know why this is happening and how to get rid of it?