code: function(passwordField) {
  	   this.options.confirmPasswordField = passwordField;
  	   this.options.messages.invalid = inputEx.messages.invalidPasswordConfirmation;
  	   this.options.confirmPasswordField.options.confirmationPasswordField = this;
  	}
docs: Set this field as the confirmation for the targeted password field:
  @param {inputEx.PasswordField} passwordField The target password field