This is just a quickie to answer a question many people seem to struggle to find the answer to.
After migrating from AS2 a lot of things changed; one of these was the method I used to use to disable the default options on the right-click menu such as the zoom and quality controls.
To do this in ActionScript 3 all you need to do is stick the following on frame 1 of your movie time line:
stage.showDefaultContextMenu = false;
Hope this helps some people out!