[PyQt] All QGroupBoxs stretchables with a QStackWidget?

[alteo_gange]

Hi!

Why all QGroupBoxs are stretchables when i rise size window in file1.txt 
without QStackWidget and not in file2.txt with QStackWidget?

How have all QGroupBoxs stretchables with QStackWidget?

-- 
alteo_gange
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#!/usr/bin/python
# -*- coding: Utf-8 -*-

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Gui(QWidget):
	def __init__(self):
		QWidget.__init__(self)
		
		vbox=QVBoxLayout(self)
		
		group=QGroupBox("groupbox1")
		hbox=QHBoxLayout(group)
		hbox.addWidget(QLabel("label1"))
		vbox.addWidget(group)
		
		group=QGroupBox("groupbox2")
		hbox=QHBoxLayout(group)
		hbox.addWidget(QLabel("label2"))
		vbox.addWidget(group)
		
		group=QGroupBox("groupbox3")
		hbox=QHBoxLayout(group)
		hbox.addWidget(QLabel("label3"))
		vbox.addWidget(group)
		
		self.setLayout(vbox)

if __name__ == "__main__":
	app = QApplication(sys.argv)
	main = Gui()
	main.show()
	sys.exit(app.exec_())
-------------- next part --------------
#!/usr/bin/python
# -*- coding: Utf-8 -*-

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Gui(QWidget):
	def __init__(self):
		QWidget.__init__(self)
		
		vbox=QVBoxLayout(self)
		
		group=QGroupBox("groupbox1")
		hbox=QHBoxLayout(group)
		hbox.addWidget(QLabel("label1"))
		vbox.addWidget(group)
		
		stacked=QStackedWidget()
		
		group=QGroupBox("groupbox2")
		hbox=QHBoxLayout(group)
		hbox.addWidget(QLabel("label2"))
		stacked.addWidget(group)
		
		group=QGroupBox("groupbox3")
		hbox=QHBoxLayout(group)
		hbox.addWidget(QLabel("label3"))
		stacked.addWidget(group)
		
		vbox.addWidget(stacked)
		self.setLayout(vbox)

if __name__ == "__main__":
	app = QApplication(sys.argv)
	main = Gui()
	main.show()
	sys.exit(app.exec_())