fd.rendered(function() {   

//clear form cache
  fd.clear();  
  
  
//hide grid containers on form load
    $('.Box1').hide();
    $('.Box2').hide();

    var radio = fd.field('rbChoice');

//show or hide grid containers when selecting values

    radio.$on('change', function(value) {

        if(radio.value.includes('Choice 1') == true) {
            //show chg-cost-center grid container
            $('.Box1').show();
            $('.Box2').hide();

            }   
        
        if(radio.value.includes('Choice 2') == true) {
            //show chg-cost-center grid container
            $('.Box2').show();
            $('.Box1').hide();

            }  
                       
    });
    
    //validate
   
    fd.field('rbChoice').$on('change', function(value){

        //clear validatior
        fd.validators.length = 0;
        //require field if Item 1 selected
        if(value == 'Choice 1') {
                fd.validators.push({
                        name: 'SingleLineText1',
                        error: "ERROR: This field is required.",
                        validate: function() {
                            if(!fd.field('Choice 1').value){
                                            return false;
                                    }
                            return true;
                        }
                });
        }
         //require field if Item 2 selected
        if(value == 'Choice 2') {
                fd.validators.push({
                        name: 'SingleLineText2',
                        error: "ERROR: This field is required.",
                        validate: function() {
                            if(!fd.field('Choice 2').value){
                                            return false;
                                    }
                            return true;
                        }
                });
        }
                
    });
    

    
});