public void setUserRef(final UserRef userRef) {
        Objects.requireNonNull(userRef);
        this.userRef = userRef;

        // Specific user so don't show the top pane
        getView().setUserListVisible(false);

        onSelection(userRef);

    }
Set the specific user

@param userRef
stroom-core-client/src/main/java/stroom/security/client/presenter/UserAndGroupsPresenter.java