Actually, Qt and Qt5 supports close buttons on tabs on all supported platforms by Qt/Qt5.
Maybe, I don't remember well. But I went by non-qt way, because it means no external (runtime) dependencies. Which was essential to my app, as being remotely developed on linux (and crossbuilt to win), it was hard for me to perform onsite maintenance.
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valdir.marcos> Does Eye Candy Controls TECTabCtrl work on Microsoft Windows?
Yes. It should work anywhere, as it seems of owner-drawn kind.
> Why have you created your own tabbed-page-control instead of using standard Eye Candy Controls TECTabCtrl?
TECTabCtrl is a tabs-only control, without container for pages, like TTabControl, not TPageControl.