'This method must return the actual interface action plugin object.'

def load_actual_plugin(self, gui):

    ac = self.actual_plugin_
    if (ac is None):
        (mod, cls) = self.actual_plugin.split(':')
        ac = getattr(importlib.import_module(mod), cls)(gui, self.site_customization)
        self.actual_plugin_ = ac
    return ac
