Problems connecting PushButtons

I im, as you probably will understand, really new to qt.

Im trying to connec a couple of pushbuttons but cant get it to work.
Lets say I have three buttons, now i them with setCheckabel(true), if I click one of the it shuld be checked but when I click another one the that was checked should uncheck and the new one should be checked.
I have tried a couple of diffrent ways but I mostly get the message that slot doesnt exist.
How do I do this?

Have a look at QButtonGroup. It solves your problem.

Thanks!!
Works like a charm : )

This might be also useful for you (complete app attached):

Code:

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myApp::myApp()
{
 
	setupUi(this);
 
	int count;
	QWidget *widget;
	QPushButton *button;
 
	count = splitter->count(); // number of buttons in splitter
	// splitter is filled with buttons in designer
 
 
	// connect them all
	for(int i=0;i<count;i++)
	{
		widget = splitter->widget(i);
		button = (QPushButton*) widget;
		connect( button, SIGNAL( toggled(bool) ), this, SLOT( checkUncheck() ) );
	}
 
}
 
 
void myApp::checkUncheck() // slot 
{
	int count, index;
	QObject *obj;
	QPushButton *button, *tmpButton;
	QWidget *widget;
 
	count = splitter->count();
 
	obj = sender();
	button = qobject_cast<QPushButton *>(obj);
 
	index = splitter->indexOf(button);
 
 
	// if state not checked - return (we just unchecked button)
	if (button->isChecked() == false) return;
 
 
	for(int i=0;i<count;i++)
	{
		if ( i == index ) continue; // we skip current button
 
		widget = splitter->widget(i);
		tmpButton = (QPushButton*) widget;
 
		if (tmpButton->isChecked() == true) tmpButton->setChecked ( false );
	}
 
}

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Note: I don't see QButtonGroup in designer (4.2.0-tp1)