Why is Qt looking for my slot in the base class instead of derived one ?

Slot in the base class instead of derived one:

           Although by adding  the Q_OBJECT macro on the derived class.

qt irc carrier:

•  The Q_OBJECT macro is present in the definition of all QObject-derived classes.
• They  declared the  QObject-derived classes in the header files ONLY.
•  The header files are listed in the  .pro file in the HEADERS= list.
• The Run qmake iun a  time to add Q_OBJECT in one of  the  classes or update the  .pro file.