can't select item in a QTreeWidget via code

I have a QCombox and in the combobo a TreeWidget

Code:

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comboBox->setModel(treeWidget->model());
comboBox->setView(treeWidget);

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Now I want to pre select an item in this treeWidget

Code:

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treeWidget->scrollToItem (Item);
treeWidget->setCurrentItem(Item);

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But for some reason, it doesn't select the Item.
In the combobox is still the first toplevelItem visible and when I click on the combobox he opens the correct toplevelitem, where Item is placed, but it's not selected.

Is it a bug, or am I on the wrong way?

Instead of this:

Code:

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treeWidget->scrollToItem (Item);
treeWidget->setCurrentItem(Item);

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You should set correct index on your QComboBox:

Code:

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comboBox->setCurrentIndex(treeWidget->indexOfTopLevelItem(Item));

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Anyway, why do you want to put a QTreeWidget into a combo box? IMHO if you have a tree structure it won't be nice. And if you don't have a tree structure, what's the point of using QTreeWidget here?