Add input hidden to all forms in UIViewRoot

Hi
I would like to add for all the forms in the UIViewRoot and input hidden componenet.
I try to do it on my ViewHandlerImp but it seems that after i add the componenet it is not renders some how and when i coming from non faces request the UIViewRoot is empty until it gets into the original renderView function.
Where is the best place to put my code inorder to add to all the forms an input hidden
Thanks
Noam

extend UIForm and add it in it's constructor.

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