setCursor & a disabled Widget

[FoX_*D i E*]

Hello !
I'ld like to set a cursor when a widget is disabled :

QPushButton *mywidget= new QPushButton();
mywidget -> setEnabled(false);
mywidget -> setCursor(Qt::ForbiddenCursor);

QPushButton *mywidget= new QPushButton();
mywidget -> setEnabled(false);
mywidget -> setCursor(Qt::ForbiddenCursor);

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It doesn't work. Qt permit that or not ?