Converts the relative position of @rect into an absolute position.To be 
        used for event considerations, blitting is handled directly by the 
        Container().

def convert_rect(self, rect):
        '''
        Converts the relative position of @rect into an absolute position.To be 
        used for event considerations, blitting is handled directly by the 
        Container().
        '''
        return self.container.convert_rect(rect.move(self.pos))