Selecting an area in canvas

Hi all,
I have a canvas inside an application. I want to select a rectangular area inside the canvas, just like  we use to select text in MS Word , i.e, by dragging the mouse by left click.  i know it can be done by Mouse_UP and Mouse_DOWN events, but what i want is that while we drag , the area gets started filling with a color.  is it possible??
Thanks

Something like this?,
http://blog.jeethukarthik.com/flex-selection-rectangle/

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