QTableView and SqlLite

[Myrgy]

I use SQLite 3.
in that database I have table

CREATE TABLE [languages] (
     id INTEGER PRIMARY KEY AUTOINCREMENT, 
     language TEXT NOT NULL , 
     used BOOL NOT NULL 
    );

CREATE TABLE [languages] (
     id INTEGER PRIMARY KEY AUTOINCREMENT, 
     language TEXT NOT NULL , 
     used BOOL NOT NULL 
    );

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I create new model and set that options

m_langugesTableModel = new QSqlTableModel(NULL, database);
 m_langugesTableModel->setTable("languages");
 m_langugesTableModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
 
res = m_langugesTableModel->select();
res = m_langugesTableModel->removeColumn(0);
res = m_langugesTableModel->setHeaderData(0, Qt::Horizontal, QObject::tr("Language"));
res = m_langugesTableModel->setHeaderData(1, Qt::Horizontal, QObject::tr("Enabled"));

m_langugesTableModel = new QSqlTableModel(NULL, database);
 m_langugesTableModel->setTable("languages");
 m_langugesTableModel->setEditStrategy(QSqlTableModel::OnManualSubmit);
 
res = m_langugesTableModel->select();
res = m_langugesTableModel->removeColumn(0);
res = m_langugesTableModel->setHeaderData(0, Qt::Horizontal, QObject::tr("Language"));
res = m_langugesTableModel->setHeaderData(1, Qt::Horizontal, QObject::tr("Enabled"));

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than I create new QTableView and set model for that view.

tv_languages->setModel(m_languagesTableModel);

tv_languages->setModel(m_languagesTableModel);

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I want to edit used field of database using QCheckBox, but if I create Delegate, than I don't now how create correct paint method for that delegate.
If I create my own model, than CheckBox draw in one place, but to edit value I had to twice click near checkbox.

I try use delegate and fags() method of my model, but than I got two checkboxes, when edit value.

How can I get CheckBox in table view, than edit with one click?

Please, help me to solve my problem.