Specifies whether the text entered into the GtkEntry field and the text
in the list items is case sensitive. Because the values are stored in a
hash, it is not legal to change case sensitivity when the list contains
elements.
combo_text :
ComboText widget
val :
make case sensitive if TRUE
Returns :
The function returns -1 if request could not be honored. On
success, it returns 0.
gtk_combo_text_select_item ()
void gtk_combo_text_select_item (GtkComboText *combo_text,
int elem);