[PyQt] What am I doing wrong with QWidget?

[Kurt Schwarz]

Hello,

I'm having problems displaying a widget as a child inside a window. The code
below should create a window that is 500 x 500 with a red box inside 400 x
400.

If I replace self.ChildWidget = AppWidget( self ) with self.ChildWidget =
QtGui.QWidget( self ) I get the desired result, what am I doing wrong with
AppWidget( ) that would cause it not to display correctly?

from PyQt4 import QtCore, QtGui

class AppWidget( QtGui.QWidget ):
    def __init__( self, parent = None ):
        super( AppWidget, self ).__init__( parent )

class AppWindow( QtGui.QMainWindow ):
    def __init__( self ):
        super( AppWindow, self ).__init__( )
        self.setGeometry( 30, 30, 500, 500 )

        self.ChildWidget = AppWidget( self )
        self.ChildWidget.setGeometry( 10, 10, 400, 400 )
        self.ChildWidget.setStyleSheet( "background-color: #ff0000" )

if __name__ == "__main__":
    import sys

    app = QtGui.QApplication( sys.argv )
    MainWindow = AppWindow( )
    MainWindow.show( )
    sys.exit( app.exec_( ) )

-- 
Best Regards,
Kurt Schwarz
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