inserting QCheckBox into the Header

[ru_core]

There will be no effect. QHeaderView is not meant to hold widgets. You need to subclass the header and put it (and handle it) there by yourself. You can use event filters to get away from subclassing but you still have to do things manually.

so, if I got correct: I need to create widget with the QCheckBox in class customClass (subclassed from QHeaderView) and simply put it by setVerticalHeader() into the view? Correct?

I am new to Qt