Download the code and Paint app for free : www.LetUsFlash.blogspot.in/2014/12/how-to-make-simple-paint-application-in.html
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How to create actionscript in external file.
Create an ActionScript file using the tools in Flash CS6
Create an ActionScript class that extends the MovieClip class
Create a constructor function
Use ActionScript code to create vector graphics
Use the MOUSE_MOVE event
Turn off an event listener
Create vector graphics for ellipse, circle using actionscript
How to make an ellipse in flash using actionscript