def visibility_changed(self, enable):
    'Notify the widget whether its container (the namespace browser \n        plugin is visible or not'
    self.is_visible = enable
    if enable:
        self.refresh_table()
Notify the widget whether its container (the namespace browser 
plugin is visible or not
def visibility_changed(self, enable):
    'Notify the widget whether its container (the namespace browser \n        plugin is visible or not'
    self.is_visible = enable
    if enable:
        self.refresh_table()