QTAbBar not displaying

[Dune]

My QtabBar is not displaying although it is compiling fine and showing the controls.

QTab *tab1 = new QTab("General");
qtb.addTab(tab1);
QTab *tab2 = new QTab("About");
qtb.addTab(tab2);

QTab *tab1 = new QTab("General");
qtb.addTab(tab1);
QTab *tab2 = new QTab("About");
qtb.addTab(tab2);

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