Killing right-click menu completely?

I am designing a game. In one chapter, I want the user to

right click and keep > to zoom in
middle click > to reset the view

This code works fine.

//my movie fps=80 and my_mc is placed on the main stage
import mx.transitions.Tween;
import mx.transitions.easing.*;
my_mc.onEnterFrame = function() {
if (ASnative(800, 2)(2)) {
this._xscale = this._yscale++;
} else if (ASnative(800, 2)(4)) {
function reset(mc) {
with (mc) {
var tweenX = new Tween(mc, "_xscale", Elastic.easeOut, mc._xscale, 100, 2, true);
var tweenY = new Tween(mc, "_yscale", Elastic.easeOut, mc._yscale, 100, 2, true);

Problem is the right-click menu,
I try “Stage.showmenu=false” but the menu is still appearing with fewer options. I want to kill this menu completely. Any ideas?