Right click full screen

how can i add full screen function to this custom right click


function newrightclick(){}
function newrightclick2(){
getURL("http://www.Test1URL.com", _blank);}
function newrightclick3(){
getURL("http://www.Test2URL.com", _blank);}
MENU.customItems.push(Functioned3);
MENU = new ContextMenu();
MENU.hideBuiltInItems();
Functioned = new ContextMenuItem("Just Text", newrightclick);
Functioned2 = new ContextMenuItem("URL 2", newrightclick2);
Functioned3 = new ContextMenuItem("URL 3", newrightclick3);
MENU.customItems.push(Functioned);
MENU.customItems.push(Functioned2);
MENU.customItems.push(Functioned3);
_root.menu = MENU;