Hide qtreewidgetitem root

[altVis]

Hi all
Is it possible somehow to hide root qtreewidgetitem, but not it's children?
For instance:

root1
|
--root2
    |
     ---child1
     ---child2

root1
|
--root2
    |
     ---child1
     ---child2

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I want to hide root2, but child1 and child2 must stay visible.