Window title disappear when MDIChildWnd is splitted with CSplitterWnd.

[KyungDong Song]

I am developing MDI child window with CSplitterWnd.
Initially, MDI child window displays only one view.

After MDIChildWnd is splitted, it has 2 or more views.
Each view is attached same Document.

But when MDI child window is splitted, child window's title is disappeared.
And MainFrame's child window title is also disappeared.

When MDI child window is resized, child window title appear at MainFrame's
child window title. But in this case, it doesn't appear at MDI child
window title.

Why this problem has occured?