I need to add a status bar beneath a table in a `QVBoxLayout`. The problem is that I don't know why status bar is not shown. In the `QBoxLayout`, I have added a tableView, under the table I need to have the status bar. Here is part of my code:

```
  self.setGeometry(200,200,600,600)
  if self._model.productName()!='':
    self.setWindowTitle('TITLE')
  QVBoxLayout(self).addWidget(self.tv)

  # add staus bar
  statusBar = QStatusBar()
  statusLabel = QLabel("Here comes the status bar message!!")
  statusBar.addWidget(statusLabel)
  QVBoxLayout(self).addWidget(statusBar)

```