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# ->getValue() ->getName() ->getWidget() ->getParent() ->getError() ->hasError()
 -  returns the form field widget
 -  returns the form field name
 -  returns the form field value
 -  returns the form field parent
 -  returns the form field error
 -  returns true if the form field has some error
 -  returns false if the form field has no error
# __toString()
 -  renders the form field with default HTML attributes
# ->render()
 -  renders the form field
# ->renderRow()
 -  renders a row
 -  can take an array of HTML attributes as its first argument
 -  can take a label name as its second argument
 -  can take a help message as its third argument
 -  renders a row when the widget has a parent
 -  throws an LogicException if the form field has no parent
# ->renderLabel()
 -  renders the label as HTML
 -  renders optional HTML attributes
 -  throws an LogicException if the form field has no parent
# ->renderLabelName()
 -  renders the label name
 -  throws an LogicException if the form field has no parent
# ->renderName()
 -  renders the name attribute of the field
 -  renders the name attribute of the field
# ->renderId()
 -  renders the id attribute of the field
 -  renders the id attribute of the field
# ->isHidden()
 -  is a proxy method to the  method of the widget
# ->renderError()
 -  renders errors as HTML
 -  renders errors as HTML when the widget has a parent
 -  renders errors as HTML when the widget has a parent
 -  throws an LogicException if the form field has no parent
 -  renders global errors as expected (global errors, hidden field errors, non existent field errors)
 -  uses the parent id format
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