docs: @OverrideOnDemand
    @OverridingMethodsMustInvokeSuper
    protected boolean performLocking (@Nonnull final WPECTYPE aWPEC,
                                      @Nonnull final DATATYPE aSelectedObject,
                                      @Nonnull final EWebPageFormAction eFormAction)
    {
      // Lock EDIT and DELETE if an object is present
      // Also lock custom actions if an object is selected
      return eFormAction.isModifying () || eFormAction.isCustom ();
    }