CTreeCtrl::CreateEx
Visual Studio 2012
Call this function to create a control (a child window) and associate it with the CTreeCtrl object.
virtual BOOL CreateEx( DWORD dwExStyle, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID );
Use CreateEx instead of Create to apply extended Windows styles, specified by the Windows extended style preface WS_EX_.