Infragistics Alignment Manager
For who is familiar with sizers there's no need to explanation.
I was noticed about this component and after a quick look at the online demo I was conviced to download and try it.
I must say the component inspector ir really well done. It can remember in some way Visual Studio's inspector for components alignment..
It allows you to easily manage your movieclips on the stage once the stage has been resized.
An example of this behavior, the way sizers work: look at Image Gallery3, navigate and try to resize the borwser window. You'll see that all the objects on the stage change their position according with the window size...
In order to download Alignment manager you need to fill a registration form: http://www.infragistics.com/..code=NAISAM