C++ non-static data member initializers of lambda function members with the 'this' object

I have an understanding problem with C++11, Visual Studio 2013 (probably not a Visual Studio problem) and non-static data member initializers of lambda function members.

class Test {
private:
    int _number;

    int _numberGetter() {
        return this->_number; // OK
    }

public:
    std::function<int(void)> NumberTest1 = [&]()->int {
        return this->_number;  // error: 'this' cannot be used inside the body of this lambda
    };
    //std::function<int(void)> NumberTest2 = Test::_numberGetter;
    std::function<int(void)> NumberTest3;
    std::function<int(void)> NumberTest4;
    std::function<int(void)> NumberTest5;
    std::function<int(void)> NumberTest6;

    Test() : NumberTest3(&Test::_numberGetter) { } // OK
    Test() : NumberTest4([&]()->int {
        return this->_number; // OK
    }) { }
    Test() {
        NumberTest5 = &Test::_numberGetter; // OK
    }
    Test() { 
        NumberTest6 = [&]()->int {
            return this->_number; // OK
        };
    }
};

Why can't I directly initialize the std::function NumberTest1 with a lambda function, in which the object instance this is.

Maybe it's because the lambda function will be directly complied, other then the normal member function _numberGetter, and in this moment the instance object this is not avalible. But this is only a presumption. Against this presumption is that NumberTest1 is not a constant and should only avalible from a class instance.

Maybe this is possible and I have only a little mistake in my code.

EIDT 1:

Visual Studio Version:

Microsoft Visual Studio Ultimate 2013

Version 12.0.31101.00 Update 4

.Net Version 4.5.51641