Compile error

    class Spacer : public ElementEx
    {
    public:
        Spacer(Vector2& size)
        : ElementEx(ElementProperties(AnchoredPosition(), size), TouchBehaviour::PassThrough)
        {
        }
    };

    // Does not work
    rowContainer->Register(new Spacer(Vector2(maxWidth, height)));

    // Works
    Vector2 spacerSize(maxWidth, height);
    rowContainer->Register(new Spacer(spacerSize));

/*
the "does not work line" generates these errors:

Candidate constructor (the implicit copy constructor) not viable: no known conversion from 'Vector2' to 'const <anonymous>::Spacer' for 1st argument

Candidate constructor not viable: expects an l-value for 1st argument
*/