Window title disappear when MDIChildWnd is splitted with CSplitterWnd.

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?

I am having a very similar issue. I have two views and toggle back and forth using ShowWindow(SW_SHOW) and ShowWindow(SW_HIDE). When I mouse click in the client area of either view, whichever one is being shown, the titlebar title disappears. Ever find a solution to your issue? Your solution may help me as well. Thanks!