How to autofit widget size and position to a cell in QTreeWidget?

[flammmable]

I pragrammaticaly create a QTreeWidget (myTree).
Then I pragrammaticaly add some items (item1, item2).
Then I add two QLabel widgets to two items (QTreeWidgetItem) by

myTree->setItemWidget(item1, 0, myLabel1);
myTree->setItemWidget(item2, 0, myLabel2);

And then I try to resize the row of the item pragrammaticaly. If I use an

item1->setSizeHint(0, QSize(myWidth, myHeight) );

the row chaged. But the myLabel1 is not. If I use an

item1->setSizeHint(0, QSize(myWidth, myHeight) );
myLabel1->resize(myWidth, myHeight);

everething is ok but the row of myLabel2 mis adjusting to label by position.
Can I do something to auto-adjusting a widget (by size and position) to a cell of QTreeWidget?

P.S. After any resizing of tree (resize by width or expand/collapse node) widgets updates correctly.

[flammmable]

myTree->resizeColumnToContent(0);