QMdiSubWindow close problem

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Hello!

I work on an IDE and I use QMdiArea and QMdiSubwindow to display textEdit area and Diagram Area as you can see in screen below:

http://tinypic.com/r/f9o7ew/6

I used the following snippet of code to activate close buttons:

@
Q_FOREACH (QTabBar* tab, ui->mdiArea->findChildren<QTabBar*>())
{
tab->setTabsClosable(true);
tab->setMovable(true);
}
@

And also the are two classes derived from QMdiSubWindow, one for diagram and one for TextEditor.
For diagram DeleteOnClose is not a option because I only need it to hide, so I re-implemented QMdiSubWindow::closeEvent(QCloseEvent):

@
void MdiDiagram::closeEvent(QCloseEvent *closeEvent)
{
Q_UNUSED(closeEvent);
visible = false;
mdiParent->removeSubWindow(this);
}
@
where mdiParent is QMdiArea

When I have multiple Editor tabs + diagram and try to close Diagram Window:

http://tinypic.com/r/28c0e48/6

everything turns up like this:

http://tinypic.com/r/1zoj5vm/6

and Editor Windows return to initial state if I press maximize button.

How can I avoid this behavior, or how can I set the rest of windows to be maximized again?