def on_closed(self):
        d = self.declaration
        if d is not None:
            d._item_closed()

    #--------------------------------------------------------------------------
    # Child Events
    #--------------------------------------------------------------------------
Set the data and update derived properties as needed.
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/qt_dock_item.py/QtDockItem.on_closed--crossover with--dataset/ETHPy150Open bokeh/bokeh/bokeh/charts/attributes.py/AttrSpec.setup