qlayout and setGeometry

[mickey]

Hi, I can't set dimension of vlay0 (or wid0) how my own; I'd like set its width such as the width of a checkBox; I tried every setGeometry but seems don't work. Why?

QGroupBox* box = new QGroupBox (myFrame);
box->setGeometry(5,5,myFrame->width()-10, myFrame->height()-10);
box->setTitle("title");		
QWidget* wid = new QWidget(box);	
QWidget* wid0 = new QWidget(wid);		
wid->setGeometry(QRect (20,20,100,50));
wid->setBackgroundColor(QColor (10,100,50));
 
wid0->setGeometry(QRect (0,0,5,20));
QBoxLayout* hlay = new QHBoxLayout (wid);
QCheckBox* c0 = new QCheckBox(wid0);
c0->setBackgroundColor(QColor (10,100,50));
QVBoxLayout* vlay0 = new QVBoxLayout (wid0);		
QLabel* l0 = new QLabel (wid0);
l0->setText("l0");
l0->setBackgroundColor(QColor (100,1,150));
vlay0->addWidget(c0);
vlay0->addWidget(l0);
hlay->addWidget(wid0);

QGroupBox* box = new QGroupBox (myFrame);
box->setGeometry(5,5,myFrame->width()-10, myFrame->height()-10);
box->setTitle("title");		
QWidget* wid = new QWidget(box);	
QWidget* wid0 = new QWidget(wid);		
wid->setGeometry(QRect (20,20,100,50));
wid->setBackgroundColor(QColor (10,100,50));

wid0->setGeometry(QRect (0,0,5,20));
QBoxLayout* hlay = new QHBoxLayout (wid);
QCheckBox* c0 = new QCheckBox(wid0);
c0->setBackgroundColor(QColor (10,100,50));
QVBoxLayout* vlay0 = new QVBoxLayout (wid0);		
QLabel* l0 = new QLabel (wid0);
l0->setText("l0");
l0->setBackgroundColor(QColor (100,1,150));
vlay0->addWidget(c0);
vlay0->addWidget(l0);
hlay->addWidget(wid0);

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