Debugger view does not show list items, if list class derives from std::list and a base class with virtual methods

I want to step through this code with QtCreator in debug mode.
But it does not show up the content of the list in right panel (local expressions) for a derived std::list class with virtual base class.
When you leave out any virtual keyword in the base class it shows all the inserted items with it's corresponding value.

#include <list>

using namespace std;

struct Base
{
    virtual ~Base(){}
};

template<class T>
struct DerivedList : public std::list< T >, Base
{
    DerivedList(): std::list< T >(), Base() {}
};

int main()
{
    DerivedList<int> myList;
    for (int i = 0;i<100;i++) myList.push_back(i);

    return 0;
}