Show items on Actionbar

[darkion]

Hello I need to know how I could show only the items which are not visible on actionbar when I press the menu button.For example I am using on the xml file \[code\]android:showAsAction="ifRoom"\[/code\] for three items. Assuming that we see the first two of them on the actionbar, how could I see only the third one when I press the menu button and now all of them?Thank you