C++ pointer to member function

I am sure I am just getting caught up in the syntactic ugliness of function pointers here, but can somebody help me out?

I am getting this compiler error on the following code:
error C2664: 'Derived::Derived(FxnPtr)' : cannot convert parameter 1 from 'void (__thiscall TestApp::* )(void)' to 'FxnPtr'

#define TEST_API __declspec(dllexport)
 
//Base and Derived classes are exported from a DLL
class TEST_API Base
{
public:
	Base() {}
	virtual ~Base() {}
};
 
typedef void(Base::*FxnPtr)();
 
class TEST_API Derived :public Base
{
public:
	Derived(FxnPtr fxn) {}
	~Derived() {}
};
 
//The following code is in the EXE
#include "windows.h"
 
class TestApp :public Derived
{
public:
	TestApp() :Derived(&TestApp::Func) {}
	~TestApp() {}
 
	void Func() {}
};
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	return 0;
}

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