I want to draw a animated bubble chart in Flex 3 / Flex 4 like the link below http://devdata.worldbank.org/DataVisualizer/
Does anyone know if this made using a readymade component or is custom developed
Any url link or source code would be appreciated.
In case you are looking for a kickstart, you should probably start with google charts.
Easiest to integrate in your application(though needs an internet connection always)
http://code.google.com/apis/ajax/playground/?type=visualization#motion_chart (It is proper bubble chart with animations and stuff)
All you really need to do is pass the data to it.