QWidget->close() doesn't actually close the QWidget

[LucaDanieli]

I have an application with many windows (QWidgets).

Particularly, each of these windows is called here SubWindow. Every SubWindow class contains a layout with a MultiEditor *sEditors, which has a menu with an action that closes the current window. Every SubWindow is created within the MainWindow.

In the SubWindow constructor I have:

connect(sEditors, SIGNAL(closeWindow()), this, SLOT(close()));
connect(this, SIGNAL(destroyed()), mainWindow, SLOT(closeWindow()));

connect(sEditors, SIGNAL(closeWindow()), this, SLOT(close()));
connect(this, SIGNAL(destroyed()), mainWindow, SLOT(closeWindow()));

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The code actually works, as the slot closeWindow() is triggered. But the SubWindow doesn't disappear and remains visible.

Has anybody something to suggest me? I don't understand what actually the problem is (neither hide() seems to work).

Thanks!