QTabWidget how to hide pane only?

I have added a QToolButton as corner widget in QTabWidget which is checkable. I want to hide all tabs (panes only) when the tool button is unchecked. I tried to connect button's signal clicked(bool) with all tab's setVisible(bool) slot not working but. I also connected tabwidget's setvisible to the signal but complete widget became invisible(it was a silly trial). Is there any way to make only pane invisible and tab bar will not disappear ?

Edit: Code (ui have a tabwidget and two tabs namely tab and tab_2)

ui->setupUi(this);
QToolButton * b = new QToolButton;
b->setCheckable(true);
b->setChecked(true);
b->setAutoRaise(true);
b->setText("Hide Tabs");
ui->tabWidget->setCornerWidget(b);
connect(b,SIGNAL(clicked()),ui->tab,SLOT(hide()));
connect(b,SIGNAL(clicked()),ui->tab_2,SLOT(hide()));

Here is my take on this. I've created a class that inherits QTabWidget. What I do is; set the "maximum vertical size of QTabWidget" to its tabBars height to hide the panels.

It is a hacky solution and I had to add some extra lines to deal with quirks.

file: hidabletabwidget.h

#ifndef HIDABLETABWIDGET_H
#define HIDABLETABWIDGET_H

#include <QTabWidget>
#include <QAction>

class HidableTabWidget : public QTabWidget
{
    Q_OBJECT
public:
    explicit HidableTabWidget(QWidget *parent = 0);
    QAction hideAction;

private slots:
    void onHideAction(bool checked);
    void onTabBarClicked();
};

#endif // HIDABLETABWIDGET_H

file: hidablewidget.cpp

#include "hidabletabwidget.h"
#include <QTabBar>
#include <QToolButton>

HidableTabWidget::HidableTabWidget(QWidget *parent) :
    QTabWidget(parent),
    hideAction("▾", this)
{
    hideAction.setCheckable(true);
    hideAction.setToolTip("Hide Panels");
    QToolButton* hideButton = new QToolButton();
    hideButton->setDefaultAction(&hideAction);
    hideButton->setAutoRaise(true);
    this->setCornerWidget(hideButton);

    connect(&hideAction, SIGNAL(toggled(bool)), this, SLOT(onHideAction(bool)));
    connect(this, SIGNAL(tabBarClicked(int)), this, SLOT(onTabBarClicked()));
}

void HidableTabWidget::onHideAction(bool checked)
{
    if (checked)
    {
        this->setMaximumHeight(this->tabBar()->height());
        this->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
    }
    else
    {
        this->setMaximumHeight(QWIDGETSIZE_MAX); // by default widgets can expand to a maximum sized defined by this macro
        this->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    }
}

void HidableTabWidget::onTabBarClicked()
{
    hideAction.setChecked(false);
}

To use this, you can simply "promote" your QTabWidget to "HidableTabWidget" using qt designer.

And here is how it looks on my system: