Call function, pass value, access variable in movieclip class from main stage

Question

i am new to flash as.
I got quite confused on some problems. as the function here
is quite different from c and asp.net.
I have a movieClip named MC, and it's enabled with action
script, with the class name MC_Rectangle
and a Stage.
I override the MC_Rectangle class file in a mc_rectangle.as
external file.
here is the code:
package{
import flash.display.*;
import flash.events.*;
public class MC_Rectangle extends MovieClip {
var sequence:int = new int();
function setSequence(data:int):void{
sequence = data;
function addSequence():void{
sequence ++;
I have new a object in the main stage var
mc_rect:MC_Rectangle = new MC_Rectangle()
question:
in main stage:
1. how can i access the variable "sequence" in "mc_rect"
2. how can i pass parametre from main stage to mc_rect via
function setSequence(data:int)?
3. how can i call the function in addSequence() in mc_rect.
in asp.net, i usually use mc_rect.sequenct,
mc_rect.setSequence(data), mc_rect.addSequence() to achieve my
goals......
btw, can function in mc_rect return out result to main stage?
thanks in advance.

Answer 1

Your as-file must be named MC_Rectangle.as (same upper/lower
case as in the Class name)
Ad 1) You have to declare sequence as a public property
"public var sequence;" or - better - define a getter-function for
sequence.
Ad 2) mc_rect.setSequence(8); e. g. (you must write "public"
in the Class-declaration of setSequence)
Ad 3) mc_rect.addSequence(); e. g. (you must write "public"
in the Class-declaration of addSequence)
... and yes, your methods can return a value: Replace "void"
with the proper data type (int, String, ...) and place a "return
myNumber;" or the like in the method's body.