Hi, there, I have a question about custom containers in Flex 4. For example, I extends DividedBox named FrameBox only changed the color of dividers, and I used it normally as the DividedBox. But I cannot add any components into it. In design node I can see these components but cannot see them in Flash Player. It seems the box's z-index is higher than components'. If I add children used this.addChild() function in its constructor it works well. Does any one know something about this? Thank you!