[gtkada] "make your choice" in a Gtk_Combo

[Thomas De Contes]

hi :-)

i need to put a "make your choice" in my Gtk_Combos to be sure that the 
user hasn't forgot it,
and i would like to hide it when the user selects an item

with a Gtk_Menu, i think i would have set a handler on the 
Gtk_Menu_Items to hide the first of them,

but as far as i understood, there is not a list of Gtk_List_Item 
attached to a Gtk_Combo on which i can set a handler nor which i can 
hide,
each Gtk_List_Item is created dynamically when i add it in the Gtk_Combo
so i don't see how i could do that

is it possible ?