public void OnManage() {
    ListModel model = (ListModel) getWindow();

    java.util.ArrayList<EntityModel> items = Linq.<EntityModel>Cast(model.getItems());
    java.util.ArrayList<network> networks = Linq.<network>Cast(getItems());

    if (getEntity() == null) {
      Cancel();
      return;
    }

    java.util.ArrayList<VdcActionParametersBase> prms1 =
        new java.util.ArrayList<VdcActionParametersBase>();
    for (EntityModel a : items) {
      boolean value = false;
      for (network b : networks) {
        if (b.getId().equals(((network) a.getEntity()).getId())) {
          value = true;
          break;
        }
      }
      if (a.getIsSelected() && !value) {
        prms1.add(new AttachNetworkToVdsGroupParameter(getEntity(), (network) a.getEntity()));
      }
    }

    // Call the command only if necessary (i.e. only if there are paramters):
    if (prms1.size() > 0) {
      Frontend.RunMultipleAction(VdcActionType.AttachNetworkToVdsGroup, prms1);
    }

    java.util.ArrayList<VdcActionParametersBase> prms2 =
        new java.util.ArrayList<VdcActionParametersBase>();
    for (EntityModel a : items) {
      boolean value = true;
      for (network b : networks) {
        if (b.getId().equals(((network) a.getEntity()).getId())) {
          value = false;
          break;
        }
      }
      if (!a.getIsSelected() && !value) {
        prms2.add(new AttachNetworkToVdsGroupParameter(getEntity(), (network) a.getEntity()));
      }
    }

    // Call the command only if necessary (i.e. only if there are paramters):
    if (prms2.size() > 0) {
      Frontend.RunMultipleAction(VdcActionType.DetachNetworkToVdsGroup, prms2);
    }

    Cancel();
  }