How to switch of antialiasing for (all) items of a goocanvasmm

["Klaus Rudolph" <lts-rudolph gmx de>]

Hi,

I simply want to switch of the antialiasing for some or all items of a goocanvasmm object.

I find a property in ItemModelSimple, but I have no idea how to set or unset the model and where it is placed 
and how to get this object from the cnavas or the canvas item. If there is any tutorial for goocanvasmm, give 
me a hint :-)

Regards
 Klaus