Syntax errors

[Glenn <glenn2 compass com ph>]

How do you use gtk_widget_hide_all (GtkWidget (widget)); 'cause if I
write that down , it gives me a syntax error I dunno why 'cause that's
how I intepreted the source, please help me. 

This also happens with me when I use 
gtk_tooltips_set_delay (GtkTooltips (tooltips), 500);

I have no Idea why I have those syntax errors, I mean when I take those
2 stuff from my code everything works fine, but I want to use them, how?
'cause apparently I'm doing something wrong eventhough thats what I
understand from the source on how to use those two functions, 

any help will be appreciated. Thanks