Problems with laying out custom widget

When I place five objects of MTR::Button class on MyWidget object (simple testing area) using QVBoxLayout I receive five buttons on one pile!

How to achieve an ordinary vertical box layout effect in this case?

MTRButton.h:

Code:

#ifndef MTR_Button_H
#define MTR_Button_H
#include <QAbstractButton>
class QSize;
class QPaintEvent;
 
namespace MTR {
class Button : public QAbstractButton {
	Q_OBJECT
public:
	Button(QWidget *parent = 0);
	Button(QString tekst, QWidget *parent = 0);
protected:
	void paintEvent(QPaintEvent *event);
	QSize sizeHint() const;
	QSize minimumSizeHint() const;
	void mouseMoveEvent(QMouseEvent *event);
	void mousePressEvent(QMouseEvent *event);
	void mouseReleaseEvent(QMouseEvent *event);
private:
	bool hovered;
	QFont font;
};
}
#endif

its implementation
MTRButton.cpp

Code:

#include "MTRButton.h"
#include <QtGlobal>
#include <QtCore>
#include <QtGui>
 
namespace MTR {
Button::Button(QWidget *parent) : QAbstractButton(parent) { setMouseTracking(true); hovered = false; }
Button::Button(QString tekst,QWidget *parent) : QAbstractButton(parent) { setMouseTracking(true); hovered = false; this->setText(tekst); }
void Button::paintEvent(QPaintEvent * /* event */) {
	QPainter painter(this);
	painter.setRenderHint(QPainter::Antialiasing, true);
	QPen borderPen(QColor(Qt::black),1);
	painter.setPen(borderPen);
	QBrush ribbonBrush(palette().dark());
	painter.setBrush(ribbonBrush);
	painter.drawRoundRect(5,5,this->width() -10, this->height() - 10,25,25);
	QBrush insideBrush(palette().mid());
	if(isDown()) insideBrush = palette().light();
	painter.setBrush(insideBrush);
	painter.drawRoundRect(10,10,this->width() -20, this->height() - 20,25,25);
	if((this->height()-20)/2 >= 0) {
		QRadialGradient gradRed(QPointF(15+(this->height()-20)/2/4, 15+(this->height()-20)/2/3), (this->height()-20)/2);
		if(!hovered) {
		gradRed.setColorAt(0,Qt::white);
		gradRed.setColorAt(1,Qt::red);
		} else {
		gradRed.setColorAt(0,Qt::white);
		gradRed.setColorAt(1,Qt::black);
		}
		QBrush circBrush(gradRed);
		painter.setBrush(circBrush);
		painter.drawEllipse(15,15,(this->height()-20)/2,(this->height()-20)/2);
 
		QRadialGradient gradGreen(QPointF(15+(this->height()-20)/2 + 2 +(this->height()-20)/2/4, 15+(this->height()-20)/2/3), (this->height()-20)/2);
		if(hovered || isDown()) {
		gradGreen.setColorAt(0,Qt::white);
		gradGreen.setColorAt(1,Qt::green);
		} else {
		gradGreen.setColorAt(0,Qt::white);
		gradGreen.setColorAt(1,Qt::black);
		}
		circBrush = QBrush(gradGreen);
		painter.setBrush(circBrush);
		painter.drawEllipse(15+(this->height()-20)/2 + 2,15,(this->height()-20)/2,(this->height()-20)/2);
	}
	painter.setPen(borderPen);
	font = QFont(tr("Arial"),10,50,false);
	painter.setFont(font);
	QRect textRect(this->height(), 5 + this->height()/6, this->width() - this->height() - 20, this->height()-20);
	painter.drawText(textRect,Qt::AlignTop | Qt::AlignHCenter, this->text());
}
QSize Button::minimumSizeHint() const {
	return QSize(200,40);
}
QSize Button::sizeHint() const {
	QFontMetrics fm(font);
	int tekstSzer = fm.width(this->text());
	return QSize(tekstSzer + 28 + 40,40);
}
void Button::mouseMoveEvent(QMouseEvent *event) {
	QRect rect(10,10,this->width()-20,this->height()-20);
	if(rect.contains(event->pos())) {
		if(hovered) return;
		else { hovered = true; update(); }
	}
	else {
		if(!hovered) return;
		else { hovered = false; update(); }
	}
}
void Button::mousePressEvent(QMouseEvent * /* event */) {
	setDown(true);
}
void Button::mouseReleaseEvent(QMouseEvent *event) {
	setDown(false);
	QRect rect(10,10,this->width()-20,this->height()-20);
	if(rect.contains(event->pos())) emit clicked();
}
}

Five such objects are placed in a QVBoxLayout on MyWidget
MyWidget.h

Code:

#ifndef TESTWIDGET
#define TESTWIDGET
#include <QWidget>
namespace MTR {
class Button;
}
class MyWidget : public QWidget {
	Q_OBJECT
public:
	MyWidget(QWidget *parent = 0);
public slots:
	void TestujPrzycisk() { qDebug("Click!"); }
private:
	MTR::Button *b1;
	MTR::Button *b2;
	MTR::Button *b3;
	MTR::Button *b4;
	MTR::Button *b5;
};
#endif

MyWidget.cpp

Code:

#include "MyWidget.h"
#include "MTRButton.h"
#include <QtCore>
#include <QtGui>
 
MyWidget::MyWidget(QWidget *parent) : QWidget(parent) {
	b1 = new MTR::Button(QString::fromUtf8("Rozpocznij grę"),this);
	b2 = new MTR::Button(QString::fromUtf8("Wczytaj grę"),this);
	b3 = new MTR::Button(QString::fromUtf8("Wyniki"),this);
	b4 = new MTR::Button(QString::fromUtf8("Zasady"),this);
	b5 = new MTR::Button(QString::fromUtf8("Wyjdź"),this);
 
	QVBoxLayout qvb;
	qvb.addWidget(b1);
	qvb.addWidget(b2);
	qvb.addWidget(b3);
	qvb.addWidget(b4);
	qvb.addWidget(b5);
	setLayout(&qvb);
}

and finally main.cpp

Code:

#include <QApplication>
#include <QtCore>
#include <QtGui>
#include "MTRButton.h"
#include "MyWidget.h"
 
int main(int argc, char * argv[]) {
	QApplication app(argc, argv);
	MyWidget widget;
	QPalette orangePalette;
		orangePalette.setColorGroup(QPalette::Active,QBrush(Qt::black),QBrush(QColor(255,180,51)),
		QBrush(QColor(255,212,71)),QBrush(QColor(70,100,105)),QBrush(QColor(255,118,54)),
		QBrush(QColor(Qt::black)),QBrush(QColor(Qt::gray)),QBrush(QColor(Qt::black)),QBrush(QColor(255,180,51)));
 
		orangePalette.setColorGroup(QPalette::Inactive,QBrush(Qt::black),QBrush(QColor(255,180,51)),
		QBrush(QColor(255,212,71)),QBrush(QColor(70,100,105)),QBrush(QColor(255,118,54)),
		QBrush(QColor(Qt::black)),QBrush(QColor(Qt::gray)),QBrush(QColor(Qt::black)),QBrush(QColor(255,180,51)));
	widget.setPalette(orangePalette);
	widget.show();
	return app.exec();
}