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How do I change the font size in the tabs?

Please create a CExtTabWnd-derived class and implement the following internal virtual method:

virtual CFont & _GetTabWndFont(
    bool bSelected,
    DWORD dwOrientation = DWORD(-1) // default orientation
    ) const;

This method should return a reference to the pre-cached CFont object. If the dwOrientation parameter is set to DWORD(-1), then you should get the orientation code by calling CExtTabWnd::OrientationGet() method. The orientation code is one of __ETWS_ORIENT_TOP, __ETWS_ORIENT_BOTTOM, __ETWS_ORIENT_LEFT or __ETWS_ORIENT_RIGHT values. You can take a look at the CExtTabWnd::_GetTabWndFont() method in the ExtTabWnd.cpp file for implementation details. If you use a tab control which is always oriented horizontally, then you need to create only one CFont instance with a font of the corresponding size. This can be done in the class constructor.