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#include <QtGui/QLabel>
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#include <QtGui/QMenuBar>
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#include <QtGui/QAction>
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QLabel* l = new QLabel( this );
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l->setText( "Hello World!" );
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setCentralWidget( l );
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QAction* a = new QAction(this);
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connect(a, SIGNAL(triggered()), SLOT(close()) );
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menuBar()->addMenu( "File" )->addAction( a );