NO button will be displayed on top left when only customized buttons are provided.

[firestarman]

To display the button group, need to add at least one of these properties : 'insertRow, deleteRow, exportCSV ' .
Source code:

    let buttonBuilder = props => {
        return (
            <ButtonGroup>
                <Link className="btn btn-primary" to="/home/advanced/userinfo">
                    <span><i className="glyphicon glyphicon-plus" />&nbsp;Add User</span>
                </Link>
                <Button
                    bsStyle="primary"
                    onClick={this.props.fetchUsers.bind(this)}>
                <span><i className="glyphicon glyphicon-refresh" /> Refresh </span>
                </Button>
            </ButtonGroup>
        );
    };

   <BootstrapTable
                    hover remote
                    data={list}
                    options={{
                        btnGroup: buttonBuilder
                    }}>

[AllenFang]

I'll check this out, thanks for feedback 👍

[AllenFang]

Released on v3.1.0