eaderOrFooterBuilder&lt;ContactInfo&gt; {

    private Header&lt;String&gt; firstNameHeader = new TextHeader(constants
        .cwCustomDataGridColumnFirstName());
    private Header&lt;String&gt; lastNameHeader = new TextHeader(constants
        .cwCustomDataGridColumnLastName());
    private Header&lt;String&gt; ageHeader = new TextHeader(constants.cwCustomDataGridColumnAge());
    private Header&lt;String&gt; categoryHeader = new TextHeader(constants
        .cwCustomDataGridColumnCategory());
    privat