                              id="btnSample" 
                                    action="#{patientInvestigationController.markAsSampled()}" 
                                    process="chkSampledOutside calSampledDate btnSample" 
                                    update="@all"
                                    icon="fa fa-check-circle" 
                                    styleClass="ui-button-success m-2"  
                                    title="Collect"
                                    >
    