custom error popup message with p4a

i did a customization for a popup message in p4a. 

here is the screenshot:

here is the code:

set red border around fields:
function setAsRequiredField( $fieldName ){
        $fieldName->setStyleProperty('border-color', 'red');
        $fieldName->setStyleProperty('border-style', 'dashed');
        $fieldName->label->setStyleProperty('font-weight', 'bold');
    }


remove formating:
function clearErrorFormatting(){
        while ($f = $this->fields->nextItem()) {
            $f->unsetStyleProperty('border-color', 'red');
            $f->unsetStyleProperty('border-style', 'dashed');
            $f->label->unsetStyleProperty('font-weight', 'bold');
        } 
    }

sample validating function that passes a message for each field:
function validateScreen(){
       
        $this->clearErrorFormatting();
       
        $statusMsg = "";
        $email_validator = new Zend_Validate_EmailAddress();
        $notEmpty_validator = new Zend_Validate_NotEmpty();
        $date_validator = new Zend_Validate_Date();
        $regex_validator = new Zend_Validate_Regex('/\d{3}\-\d{3}\-\d{4}/');
       
        if( $this->fields->title_id->getNewValue() == 0 ){
            $this->setAsRequiredField( $this->fields->title_id );
            $statusMsg .= "Title is required
";
        }

        if( !$notEmpty_validator->isValid( $this->fields->first_name->getNewValue() ) ){
            $this->setAsRequiredField( $this->fields->first_name );
            $statusMsg .= "First Name is required
";
        }
                      
        if( empty( $statusMsg ) ){
            $this->insertMember2();
        } else {
            $this->warning($statusMsg);
        }
    }

the message for each error is concatenated to this variable, $statusMsg, than passed to the warning function for p4a. once it is passed to the function, it show the popup for the error messge.