frameless mdi child in workspace ?

["Honglin Ye"]

Hi, All,
    I would like to make children in a workspace frameless.
This should be possible. However, the following makes all
children disapear instead. How to?
    Thanks.
------------
    foreach (QWidget *window, workspace->windowList()) {
        MdiChild *mdiChild = qobject_cast<MdiChild *>(window);
        mdiChild->setWindowFlags(Qt::Sheet | Qt::FramelessWindowHint);
        mdiChild->raise();
    }
------------

-- 
Honglin Ye

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