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Is there the way to change the size of tabs in CExtTabPageContainerWnd - I want to make them bigger, for example?

You should create a CExtTabPageContainerWnd-derived class which uses a custom tab control for re-measuring tab item sizes:

class CYourTabWnd : public CExtTWPC < CExtTabWnd >
{
public:
    virtual void OnTabWndUpdateItemMeasure(
        TAB_ITEM_INFO * pTii,
        CDC & dcMeasure,
        CSize & sizePreCalc
        )
    {
        CExtTWPC < CExtTabWnd > :: OnTabWndUpdateItemMeasure( pTii, dcMeasure, sizePreCalc );
        sizePreCalc.cx += 10; // increase width of tab items to 10 pixels
    }
};

class CYourTabPageContainerWnd : public CExtTabPageContainerWnd
{
public:
    virtual CExtTabWnd* OnTabWndGetTabImpl()
    {
        return new CYourTabWnd;
    }
};

Not working at al - Throwing an exceptions all the time

My fault - need to use

CExtTabOneNoteWnd

instead of CExtTabWnd in my case and it works.

Thank you very much