The SCALEPANE is a container component that can scale its content.

If defining WITHUSERSCALING to "true" then the user can scale the content on his/her own. In a desktop system this is done either by pressing the ctrl-key and spinning the mouse wheel or by using the keyboard short cuts "ctrl-+", "ctrl--" and "ctrl-0". 

Please pay attention: in this case the VALUE is not only read from the server side but also is written back: your server-side property binding must provide a corresponding set-ter method. - By setting FLUSH to "true" changes are sent to the server immediately, otherwise changes are sent with the next round-trip.