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I need to place several instances of a custom QPushButton subclass adjacent to one another. For some reason, the buttons overlap one another when painted. A simplified example of the problem is below. Here is the (incorrect) output: Here is the code: #include <QtGui> class MyButton : public QPushButton { public: explicit MyButton(Qt::GlobalColor color, QWidget *parent = NULL) : QPushButton(parent), color_(color) { setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed); } QSize sizeHint() const { return QSize(50, 25); } protected: void paintEvent(QPaintEvent *) { QPainter painter(this); painter.setOpacity(0.5); painter.fillRect(0, 0, width(), height(), color_); } private: Qt::GlobalColor color_; }; int main(int argc, char **argv) { QApplication app(argc, argv); QWidget widget; QHBoxLayout *layout = new QHBoxLayout; layout->setSpacing(0); MyButton *w1 = new MyButton(Qt::red); MyButton *w2 = new MyButton(Qt::green); MyButton *w3 = new MyButton(Qt::blue); layout->addWidget(w1); layout->addWidget(w2); layout->addWidget(w3); widget.setLayout(layout); widget.show(); return app.exec(); } What is causing this, and how do I fix it? BTW, I tried something similar with regular QWidget subclasses (instead of QPushButton subclasses), and there is no problem. It is something peculiar to QPushButton . UPDATE: I'm really thinking now that this is a bug. I submitted it to the Qt Bug Tracker ; we'll see what the Trolls think. In any case, deriving from QAbstractButton fixes the drawing problem ... I just had to re-implement some of the functionality I needed. UPDATE 2: The Trolls at Qt provid

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