ActionScript 2.0 :: Sketch Drawing To Specific Area (Movie Clip) / For Math Process Visualization

By the way i want to make a visualization about a math process to show partial function graph.

I think i can make a scene which in 1000x1000 pixels. I'll start from top of scene and when i press a button i'll move camera to second section which i want to do sketch. I want to make a sketchpad which can draw in a 2 part movieclip. First part is -X section of XY Axis Graph. Second part is +X section of XY Axis Graph. I'll put image of XY Axis Graph to -X and +X section of XY Axis Graph. So it'll be seem like one part. And i'll draw to -X section. After that i'll skip to second sketchpad with camera. And i'll make same thing. But for now i'll draw to +X. And when i press conclusion button camera will skip to bottom of scene and move -X of figure1 and +X of figure2 to bottom. So i can see figure1's -X section and figure2's +X section as merged in bottom. So it'll show to me partial function graph.

But problem is sketchpad is drawing to _root. So i'm unable to move sketch or shapes on XY Axis Graph. But if i can draw that to movie clip i can move it like an object with drawing and merge it like i want.

So i want to make a sketchpad which make drawing in limits of movieclip.

how i can do it ? Also i'm using following code:

Code:
import mx.controls.Loader;
// 1. SETTING THINGS
// ----------------
_root.createEmptyMovieClip("line",1);

[Code]....