[TYPO3-formidable] trouble with getThisFormData / getAbsName

[Miguel Ayala]

Hello,
I am having trouble with an Extension which used to work fine, it access a childrenderlet via getThisFormData('parent.child'),
the xml is renderlet:BOX name="parent" and the child is renderlet:TEXT name="child", we had an typo3 update and since then, this doesnt work on the childs anymore, returning an fatal error on the getAbsName(), is there a new way to access the childs now ?
thanks for your help!
Miguel