I want to put some elements of my UI in a scroll area as there can be a lot of them. I tried the following peice of code, but the area just keeps growing as I put more elements on it.

In the first part I set up a scroll area, a widget and a layout. I apply the layout to the widget and I set the widget to the scrollarea. Then I fill in my layout in an external function. The button under all of it allows to fill more elements in the layout.

Qt Code: 
  1. scrollRow = QtGui.QScrollArea()
  2.     scrollRow.setMaximumSize(600, 400)
  3.     self.rowAssetWidget = QtGui.QWidget()
  4.     self.rowAssetLayout = QtGui.QGridLayout()
  5.     self.rowAssetLayout.setSpacing(20)
  6.     self.rowAssetWidget.setLayout(self.rowAssetLayout)
  7.     scrollRow.setWidget(self.rowAssetWidget)
  8.     #self.mainLayout.addLayout(self.rowAssetLayout, 2, 0)
  9.     self.mainLayout.addWidget(self.rowAssetWidget, 2, 0)
  10.     self.assetRow()
  11.  
  12.     self.addAssetRowBtn = QtGui.QPushButton("+")
  13.     self.addAssetRowBtn.setFixedSize(20, 20)
  14.     self.mainLayout.addWidget(self.addAssetRowBtn, 3, 0)
  15.     self.connect(self.addAssetRowBtn, QtCore.SIGNAL("clicked()"), self.addAssetRow)
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My elements appear fine, but it is not scrolling. Any idea ?