Add an option to Flash contex window using Javascript

I am tring to create a Chrome extension that adds a contex menu entry when ever the right mouse button is clicked.

I also need for the new entry to be displayed when the 开发者_如何转开发right click is on a flash object (Such as Youtube clip) I cannot find a way to do it...

Can it be done? What directions should I check?

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Can't do this (not from JavaScript, and probably not from Flash, either). The menu that you get when you right-click in a Flash object is generated by your Flash interpreter, not the browser - and IIRC can't be overridden.