GtkLabel::set_text
void set_text(string 
      label_text
     ); 
    
     Sets the text for the label widget. Previous text in the label
     is not stored.
    
    
     Note that any existing underlines are not overwritten in the
     same way that text is; use 
     set_pattern()  with no
     parameters to erase these.
    
    
     
      $label->set_text("Whatever text you wish to pass");