Yes but it has to be done on the client. You can attach a javascript event to a Button using the JavaScript extender (use the “execute” event) component and use the fullscreenapi included in qooxdoo like this:
http://www.qooxdoo.org/5.1/api/#qx.bom.FullScreen
We’ll probably post an example. You can query whether the browser is in full screen mode using Application.Browser.IsFullScreen.
It is not possible to change the fullscreen mode in an ajax call, it must be done on the client processing a user event (a click).
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