Hi,
I have qtabwidget with corner widget. I added QToolButton as corner widget.

Qt Code: 
  1. btnMenu = new QToolButton(this);
  2.     btnMenu->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
  3.     btnMenu->setAutoRaise(true);
  4.     btnMenu->setIcon(QIcon::fromTheme("tab-new"));
  5.     btnMenu->setText(trUtf8("Pars"));
  6.     btnMenu->setShortcut(QKeySequence::AddTab);
  7.     btnMenu->setMenu(menu);
  8.     btnMenu->setPopupMode(QToolButton::MenuButtonPopup);
  9.     setCornerWidget(btnMenu,Qt::TopLeftCorner);
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And I have "mouseRelaseEvent" for tabwidget like this:


Qt Code: 
  1. void PTabWidget::mouseReleaseEvent(QMouseEvent *event)
  2. {
  3.     if (event->button() == Qt::MidButton)
  4.     {
  5.         int index = tabBar()->tabAt(event->pos());
  6.         if (index != -1)
  7.         {
  8.             this->removeTab(index);
  9.             qDebug() << QString::number(index);
  10.             return;
  11.         }
  12.         else
  13.         {
  14.             return;
  15.         }
  16.     }
  17.  
  18.     PTabWidget::mouseReleaseEvent(event);
  19. }
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When I click with mid-button to tabbar, the output is "The program has unexpectedly finished.". But when i remove the tool button, it works fine. Is it bug or I miss something ??

Sorry for my poor English.
Best regards.