Flash Dragable chart


Iam new to flash and actionscript. I have very basic knowledge of actionscript.
I wanted to know how the dragable chart works like the one in fusionchart

Dynamically increasing/decreasing the chart, should be able to change y-axis on mouse down move.
I have attached a screenshot taken from fusionchart. I want to build something like that with little variation.

What do you mean by draggable charts ? If you are referring to the tooltip then you need to create a UI element that follows the mouse by looking for its X & Y properties.