delete.cpp

#include "widget.h"
#include <QFormLayout>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QDebug>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    reset = new QPushButton("reset");

    box = new QGroupBox(0);

    mainLayout = new QVBoxLayout;
    mainLayout->addWidget(reset);
    mainLayout->addWidget(box);

    setLayout(mainLayout);

    connect(reset, SIGNAL(clicked()), this, SLOT(resetPressed()));

    show();

    qDebug() <<"init end";
}

void Widget::resetPressed()
{
    box->hide();
    box->deleteLater();

    box = new QGroupBox(this);
    boxLayout = new QFormLayout();

    for(unsigned int i=0; i<3; i++)
    {
        QPushButton *trickyButton = new QPushButton;
        boxLayout->addRow("hopeless button", trickyButton);
    }

    mainLayout->addWidget(box);
    box->setLayout(boxLayout);
    box->show();

    qDebug() << "items after add: " << boxLayout->count();
}

Widget::~Widget()
{

}