CWnd::CreateEx on NT

My application creates sub-windows that can be moved outside of the
parent's frame.  I have to use CreateEx() to do this.  This works under
Win95 but fails in NT.  I do not want these windows to appear in the
TaskBar.  So, I create a hidden window like this:

m_HiddenWnd.CreateEx(0, "SubWnd", "", WS_CHILD|WS_POPUP,
         0, 0, 1, 1, NULL, (HMENU)1);

The variable m_HiddenWnd is a CWnd.  Then I create the real window with
this as its parent.  The problem is the combination of WS_CHILD and
WS_POPUP.  The docs say you can't use these together.  However, if I
remove either of them the window fails to create.  But, on NT this fails
no matter what I do!!!!  What is the minimum I have to do to create a
window that is not owned by the MainFrame on both NT and 95?

Vance KesslerAsked:
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GrzesCommented:
On your frame window create a child window using CreateEx() function and add follwing extended style:
WS_EX_TOOLWINDOW - it creates a tool window, which is a window intended  to be used as a floating toolbar. A tool window has a title bar that is shorter than a normal title bar, and the window title is drawn using a smaller font. A tool window does not appear in the task bar or in the window that appears when the user presses ALT+TAB.
And add any combination of styles, but don't add WS_POPUP style.
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