@staticmethod
def defaultLayout():
    """Return default options for :meth:`.ViewPanel.togglePanel`.

        This method may be overridden by sub-classes to return a ``dict``
        containing keyword arguments to be used by the
        :meth:`.ViewPanel.togglePanel` method when a control panel of this
        type is added. When ``togglePanel`` is called, if any arguments are
        provided, the arguments returned by this method are not used.
        """
    return None
