how to derive a class from 2 WTL classes

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C++

WTL

Hi all

I have a button class :

class CTransparentBtn : virtual public CWindowImpl<ctransparentbtn, WTL::CButton, CControlWinTraits>
{
// ...
};

and I've found this class for menu button from codeproject.com

namespace WTLEX
{

template <bool class="" tbase="WTL::CButton," twintraits="CControlWinTraits">
class ATL_NO_VTABLE CMenuButtonImpl : public CWindowImpl< T, TBase, TWinTraits>
{
// ...
};

class CMenuButton : public CMenuButtonImpl<false, CMenuButton>
{
// ...
};

} //namespace WTLEX</bool>

so How can I derive "CMenuButton" from "CTransparentBtn" to use CTransparentBtn's functions??

thank u in advance