'search all plugins in directory plugins/external/proxy'

def SearchProxyPlugins(self):

    self.comboxBox.clear()
    self.plugin_classes = Plugin.PluginProxy.__subclasses__()
    self.plugins = {}
    for p in self.plugin_classes:
        self.plugins[p._name] = p()
    self.comboxBox.addItems(self.plugins.keys())
