The problem is that buttonClickedEvent is a member function and you need a pointer to member in order to invoke it.
Try this:
void (MyClass::*func)(int); func = &MyClass::buttonClickedEvent;
And then when you invoke it, you need an object of type MyClass to do so, for example this:
(this->*func)(<argument>);
http://www.codeguru.com/cpp/cpp/article.php/c17401/C-Tutorial-PointertoMember-Function.htm
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