Hello, I have such a problem with AjaxFormComponentUpdatingBehavior. 
I have some DropDownChoice and a CheckBox on a Form. I need to make a change
to DropDown, when I click on CheckBox. But as I try to submit a Form, got
some error, and then click CheckBox DropDown doesn`t change. The code looks
like this: 

   DropDownChoice<SomeEnum> dropDownz = new
DropDownChoice<SomeEnum>("dropDownId",
                        Arrays.asList(SomeEnum.values()), new
EnumChoiceRenderer<SomeEnum>(this));
   getGenericModelObject().setValues(SomeEnum.FIRSTVALUE);
   CheckBox boxz = new CheckBox("BoxId");
   boxz.add(new AjaxFormComponentUpdatingBehavior("onchange")
                {
                        @Override
                        protected void onUpdate(AjaxRequestTarget target) {
                                if (boxz.getModelObject())
                                {
                                        
getGenericModelObject().setValues(SomeEnum.SECONDVALUE);
                                        get("dropDownId").setEnabled(false);
                                        target.addComponent(get("dropDownId"));
                                }
                                else
                                {
                                        get("dropDownId").setEnabled(true);
                                        target.addComponent(get("dropDownId"));
                                }
                        }
                        @Override
                        protected void onError(AjaxRequestTarget target, 
RuntimeException e) {
                                if (boxz.getModelObject())
                                {
                                        
getGenericModelObject().setValues(SomeEnum.SECONDVALUE);
                                        get("dropDownId").setEnabled(false);
                                        target.addComponent(get("dropDownId"));
                                }
                                else
                                {
                                        get("dropDownId").setEnabled(true);
                                        target.addComponent(get("dropDownId"));
                                }
                                super.onError(target, e);
                        }
                });
     Form form = new Form("formId", getGenericModel());
     form.add(dropDownz);
     form.add(boxz);

So as I said, after form validation, if errors occur, it won`t change
dropdown to SECONDVALUE, but sets it as setEnabled(false), why this happens?

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