Chrome extension > contextMenus Api > can not add onclick handler

Question

I am trying to create a chrome extension. Currently I am about to create context menu for my extension, which will do something when I click on it. So, following google docu

Answer 1

Event based background pages (persistent=false) have to use chrome.contextMenus.onClicked listeners.

chrome.contextMenus.create({...});
chrome.contextMenus.onClicked.addListener(function(info, tab) {
    alert("bla bla bla");
});