ArgumentError: Error #2025: The supplied DisplayObject must
be a child of the caller.
But as you can see in the trace-output: lbl_A and lbl_B are
of course children of aPanel. Do I use the function swapChildren()
the wrong way? Or is this a bug?
In my application I use aPanel.setChildIndex(lbl_A, 0) as a
workaround, but I'm not sure if this will always work.