Processes events for the menu tree.
        
        :param      event | <QEvent>

def eventFilter( self, object, event ):
        """
        Processes events for the menu tree.
        
        :param      event | <QEvent>
        """
        if ( not event.type() in (QEvent.DragEnter,
                                  QEvent.DragMove,
                                  QEvent.Drop) ):
            return False
        
        # support dragging and dropping
        if ( event.type() in (event.DragEnter, event.DragMove) ):
            data = event.mimeData()
            if ( data.hasFormat('application/x-actions') ):
                event.acceptProposedAction()
            return True
        
        # handle creation of new items
        if ( event.type() == QEvent.Drop ):
            data      = event.mimeData()
            actions   = nativestring(data.data('application/x-actions'))
            
            # determine the drop item
            pos       = event.pos()
            pos.setY(pos.y() - 20)
            drop_item = self.uiMenuTREE.itemAt(pos)
            
            tree = self.uiMenuTREE
            for key in actions.split(','):
                if ( not key ):
                    continue
                
                item = self.createActionItem(key)
                self.addMenuItem(item, drop_item)
                drop_item = item
                
            return True
            
        return False