Let user drag drop dynamic components, resize them

I'm just wondering how you can create UI components and let
the user drag and drop them on the screen
let the user resize the elements, change the text for example
or rotate the element (just like scrapblog)
Lets say you want to have an image object.
Do have to create your own custom components that inhertis
from the image component
add some kind of handle objects and handle al the events so
the user can change the size and rotate it
Or is there a much easier way of doing this kind of cool
stuff
If anyone knows how this kind of technique is called, let me
know its hard to find something about it (in any language,
if i search for wysiwyg drag and drop in flex or .NET i
mostly get results like FlexBuilder en Visual Studio not how to
program such special components)
grtz

Did some more searching and already found some cool examples
http://www.rogue-development.com/objectHandles.html
http://blogs.adobe.com/flexdoc/2007/03/creating_resizable_and_draggab.html
more examples are still welcome :)

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