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How to customize tittle bar of QMdiSubWindow with QStyleOptionTitleBar?

  • Hi i in my program have a QMdiarea, when the user
    clik on new file, a QMdiSubWindow is added.

    Inside the QMdiSubWindow is a Qmainwindow because need another menu an Qtoolbar

    So the question is
    how can change the QMdiSubWindow tittle bar, Or the child Qmainwindow

    I want one with a slim tittle and a little close button.
    Also want to customize the color of border and tittle background.

    I know that exist QStyleOptionTitleBar but dont find any sample.
    and the sample
    only change interior apearence.

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