I create a custom component (AttrLable) which extends AbstractField. In the
BeginRender(MarkupWriter writer), I will need to override the label tag
based on whether there is an error in the input field which is associated to
this label. 

On the form submission, I will do the form validation and if errors are
found, I will highlight the label and input field in the form page. But the
problem is how I can pass the error flag to the component class (Attrlabel)
which will rend the component.

Thanks in advance!


Xinhua 
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