PluginLV2ParentUI *del_ui(PluginLV2Client *client);
PluginLV2ParentUI *del_ui(PluginLV2ClientWindow *gui);
PluginLV2ParentUI *add_ui(PluginLV2ParentUI *ui, PluginLV2Client *client);
PluginLV2ParentUI *del_ui(PluginLV2Client *client);
PluginLV2ParentUI *del_ui(PluginLV2ClientWindow *gui);
PluginLV2ParentUI *add_ui(PluginLV2ParentUI *ui, PluginLV2Client *client);