layout update problem

[tuli]

I have the following layout:

<vl>
    <hl>
        <otherstuff/>
    </hl>
    <hl2>
        <tabwidget/>
    </hl2>
<vl>

<vl>
    <hl>
        <otherstuff/>
    </hl>
    <hl2>
        <tabwidget/>
    </hl2>
<vl>

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"Other stuff" includes a toggle button. If this button is toggled, i'd like to hide <tabwidget> or the entire <hl2> layout.
I cant seem to find a way to hide an entire layout, so i called setVisible() on the tabwidget:

ui.tabWidget->setVisible(ui.btnTog->isChecked());
	this->updateGeometry();
	this->update();
	ui.horizontalLayout_5->update();

ui.tabWidget->setVisible(ui.btnTog->isChecked());
	this->updateGeometry();
	this->update();
	ui.horizontalLayout_5->update();

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As you can see i called all update/refresh related methods afterwards, but the dialog layout doesnt change.
That means there's a big, empty unused spot where the tabwidget used to be.


What do i have to do to force the widget to recalculate its layout and consider the now hidden tabwidget?