Nothing appears in QScrollArea

[space_otter]

The following code appears in a custom dialog constructor:

layout = QVBoxLayout()
 
watcher = DWatcher(None, DProperties({'value':settings}))
 
scroller = QScrollArea()
scroller.setWidget(watcher)
layout.addWidget(scroller)
 
layout2 = QHBoxLayout()
layout2.addWidget(QPushButton('OK'))
layout2.addWidget(QPushButton('Cancel'))
layout.addItem(layout2)
 
self.setLayout(layout)

layout = QVBoxLayout()
		
watcher = DWatcher(None, DProperties({'value':settings}))
		
scroller = QScrollArea()
scroller.setWidget(watcher)
layout.addWidget(scroller)
		
layout2 = QHBoxLayout()
layout2.addWidget(QPushButton('OK'))
layout2.addWidget(QPushButton('Cancel'))
layout.addItem(layout2)
		
self.setLayout(layout)

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When the dialog appears, there is nothing in the scrollarea. DWatcher has a layout after its constructor exits. If I simply add the DWatcher, it works just like it's supposed to, but it can be really big so I want it in a scrollarea. Any ideas how this might happen?