incorrected QComboBox capture screen.

[minsoub]

attached file : QComboBox capture.

apply code

// ICAO CD
	cboIcao_cd->clear();
	cboIcao_cd->setModel(ComboDataCollection::getInstance().getTableModel(icao_cdModel, "TB_CNTRYCD", QStringList() << "ICAO_CD"));
	cboIcao_cd->setModelColumn(0);
 
	// Combo box Height
	cboIcao_cd->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	QCompleter *p = new QCompleter(icao_cdModel);
	p->setCompletionMode(QCompleter::PopupCompletion);
	p->setMaxVisibleItems(20);
	cboIcao_cd->setCompleter(p);
	cboIcao_cd->show();

// ICAO CD
	cboIcao_cd->clear();
	cboIcao_cd->setModel(ComboDataCollection::getInstance().getTableModel(icao_cdModel, "TB_CNTRYCD", QStringList() << "ICAO_CD"));
	cboIcao_cd->setModelColumn(0);

	// Combo box Height
	cboIcao_cd->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
	QCompleter *p = new QCompleter(icao_cdModel);
	p->setCompletionMode(QCompleter::PopupCompletion);
	p->setMaxVisibleItems(20);
	cboIcao_cd->setCompleter(p);
	cboIcao_cd->show();

To copy to clipboard, switch view to plain text mode 

The code execute, then QComboBox size is overflowed , like attached file.

What is incorrect it?

If someone has a simple example I'd greatly appreciate it.