how to hide root items in a treeview withouth hide childs??

Hi list.
I need help!!

i'm trying to make a list with two modes, list and tree, using a treemodelfilter over a treestore. I'm setting a visible function with filter_tree->set_visible_fun, but in the function, when a root node is hidden, all child nodes become hidden also.
Is there any way to hide root rows withouth hide child rows??

Juan Ángel

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