PRB: Cannot Use TAB to Move from Standard Controls to Custom

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With the new way of customizing the File Open or Save As common dialog in Windows 95 or later, you can customize applications to provide a custom dialog box template that adds controls to the default Open or Save As dialog box. This custom dialog box is created as a child of the default dialog box and thus requires a WS_CHILD style.

DS_CONTROL makes a modal dialog created as a child of another dialog interact well with its parent dialog. This style ensures that the user can move between the controls of the parent dialog and the child dialog - or in this case between the standard Open or Save As common dialog and the custom dialog provided by the application.