C++ Member function pointers wrapper

// Function Pointer wrapper
class FunctionPointer
{
public:
    virtual void Call() {}
};

template <typename T>
class FunctionPointerTemplate : public FunctionPointer
{
public:
    FunctionPointerTemplate(T* object, void (T::*member_function)())
    { pObject = object; pMemberFunction = member_function; }

    void Call()
    { (pObject->*(pMemberFunction))(); }

private:
    T* pObject;
    void (T::*pMemberFunction)(); 
};

// Button class member function, called upon to link a function to the button action.
    template <typename T>
    void LinkFunction(T* object, void (T::*member_function)())
    {
        if (m_pFunction != NULL) // m_pFunction is initialized to NULL in constructor
        { delete m_pFunction; }

        FunctionPointerTemplate<T>* function = new FunctionPointerTemplate<T>(object, member_function);
        m_pFunction = function;
    }

// Linking a function (the 'Apply' function of a dialog window) to the Button
pButton->LinkFunction(pDialogWindow, &DialogWindow::Apply);