setting the mainItem property of a Dialog element, it will create a top level window with that item as the graphicsWidget()
right now it works only with QGraphicsWidget{} elements, Plasma::Dialog will be given the api to make this work with any QGraphicsObject as well.
make it available as a QAbstractModel, so will be possible to categorize it
(considering to put it behind a qsortfilterproxymodel to make it easy to do filtering)
svn path=/trunk/KDE/kdebase/runtime/; revision=1189920