Resizes the current widget and its parts widget.
        
        :param      event | <QResizeEvent>

def resizeEvent( self, event ):
        """
        Resizes the current widget and its parts widget.
        
        :param      event | <QResizeEvent>
        """
        super(XNavigationEdit, self).resizeEvent(event)
        
        w = self.width()
        h = self.height()
        
        self._scrollWidget.resize(w - 4, h - 4)
        
        if ( self._scrollWidget.width() < self._partsWidget.width() ):
           self.scrollParts( self._partsWidget.width() - self._scrollWidget.width() )