Qt5 Issue with using several setupUi()

#include <QApplication>
#include <QDebug>

#include "ui_AdminManager.h"
#include "ui_Test1.h"
#include "ui_Test2.h"

int main(int argc, char *argv[]) {
    QApplication application(argc, argv);
    AdminManager mgr;
    return application.exec();
}

namespace Ui {
class AdminManager;
}

class AdminManager : public QDialog {
    Q_OBJECT

public:
    explicit AdminManager(QWidget *parent = 0);
    ~AdminManager();

private:
    Ui::AdminManager * ui;
    Ui::Test1        * ui_test1;
    Ui::Test2        * ui_test2;

private slots:

signals:

};

AdminManager::AdminManager(QWidget *parent) : QDialog(parent), ui(new Ui::AdminManager) {
    qDebug() << 0;
    ui->setupUi(this);
    qDebug() << 1;
    ui_test1->setupUi(ui->widget1);
    qDebug() << 2;
    ui->widget1->show();
    qDebug() << 3;
    ui_test2->setupUi(ui->widget2);
    qDebug() << 4;
    ui->widget2->show();
    qDebug() << 5;
    this->show();
}
AdminManager::~AdminManager() {
    delete ui;
}