Called when this item has been selected (sel=True) OR deselected (sel=False)

def selected(self, sel):
        """Called when this item has been selected (sel=True) OR deselected (sel=False)"""
        ParameterItem.selected(self, sel)

        if self.widget is None:
            return
        if sel and self.param.writable():
            self.showEditor()
        elif self.hideWidget:
            self.hideEditor()