Nesting UIComponents

1

I am trying to create a container type component (which extends UIComponent), for flash. Now the problem is that if the added content contains other UIComponents, they will not be drawn. I cannot call drawNow() on them, since they can be unknown, or private. Components such as scrollPane display content with UIComponents correctly, but for some reason I cannot find in its source how it does that…If I nest a scrollPane in UIComponent, UIComponents in the scrollPane content do not display correctly either. Any ideas how I can force them to redraw?