QGroupBox and signal clicked(bool)

[codebehind]

I have a GUI done with designer (qt4)

it has a groupbox: theGroup
it has some radiobuttons: radio0, radio1, radio2;
it has a listwidget: monitor

then i've created a class MyClass which is derived from the gui.

I try to create a connection:

void theGroup::on_theGroup_clecked(bool )   
{
   qDebug("done.");
}

void theGroup::on_theGroup_clecked(bool )   
{
   qDebug("done.");
}

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the result is that there is no msg on the console.
Then i tried to connect the radiobutton signal with a slot i've created and it works fine. I am lost.