Nor base nor derived virtual function being properly called

I have this base class:

class Gadget // put the display in a macro on a .h file for less headache.
{
  protected:
    int x, y;
    U8GLIB * u8g;

virtual int  f_focus()  {return 0;};
virtual int  f_blur()   {return 0;};
virtual void f_draw()   {};
virtual void f_select() {};


  public:
    Gadget(U8GLIB * u8g, int x, int y) :
      u8g(u8g),
      x(x),
      y(y)
      {
        Serial.println(F("Gadget(U8GLIB * u8g, int x, int y)"));
      };

Gadget() 
  {
    Serial.println(F("Gadget()"));
  };

int     focus(){return f_focus();};
int     blur(){return f_blur();};
void    draw(){f_draw();};
void    operator()(){f_select();};
};

And this derived class:

class WakeUp : public Gadget
    {
      public:
        WakeUp(U8GLIB * u8g) :
         Gadget(u8g, 0, 0)
         {
          Serial.println(F("WakeUp(U8GLIB * u8g)"));
         };

    };

Then I instantiate the WakeUp class inside an array like this:

Gadget gadgets[1] = {
        WakeUp(&u8g)
      };

Then I try to access this member like this:

void focus()
      {

        Serial.println(gadgets[0].focus());

      }  

It is supposed to display 0. However it is displaying -64. Even if I override the f_focus() method on WakeUp class. If I remove the virtual specifier from f_focus() it works fine, displaying 0, but I will not be able to access the derived class implementation of this method. I wish to understand what is causing this strange behavior and what can I do to avoid it.

Thank you all.