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#include <QTreeView>
#include <QPushButton>
#include <QStandardItemModel>
#include <QVBoxLayout>

class Win : public QWidget
{
    Q_OBJECT
    QPushButton* btn;
    QStandardItemModel* model;
    bool filled;

private slots:
    void on_btn_clicked() {
        if(!filled) {
            model->clear();
            QStandardItem* parent = new QStandardItem("Parent");
            model->appendRow(parent);;
            parent->appendRow(new QStandardItem("Do not Delete"));
            parent->appendRow(new QStandardItem("To Delete"));
            btn->setText("Delete Item");
            filled = true;
        } else {
            model->item(0)->removeRow(1);
            btn->setText("Clear and refill Model");
            filled = false;
        }
    }

public:
    Win() : filled(false) {
        QVBoxLayout* layout = new QVBoxLayout(this);
        QAbstractItemView* view = new QTreeView;
        layout->addWidget(view);
        btn = new QPushButton("Fill Model");
        layout->addWidget(btn);
        connect(btn, SIGNAL(clicked()), SLOT(on_btn_clicked()));
        model = new QStandardItemModel(this);
        view->setModel(model);
    }
};