ok,
i've got it.
dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
Tab_Model *delegate = new Tab_Model;
lb->setModel(m);
dock->setMaximumWidth( 327 );
dock->setWidget(lb);
addDockWidget(Qt::RightDockWidgetArea, dock);
QDockWidget *dock = new QDockWidget(tr("Model"), this);
dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
lb = new QTableView(dock);
QStandardItemModel *m = new QStandardItemModel(25, 5);
Tab_Model *delegate = new Tab_Model;
lb->setModel(m);
dock->setMaximumWidth( 327 );
dock->setWidget(lb);
addDockWidget(Qt::RightDockWidgetArea, dock);
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thx
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