gtk/gtk.go
func (v *TreeModel) GetColumnType(index int) glib.Type {
	c := C.gtk_tree_model_get_column_type(v.native(), C.gint(index))
	return glib.Type(c)
}
func (v *TreeModel) GetColumnType(index int) glib.Type {
	c := C.gtk_tree_model_get_column_type(v.native(), C.gint(index))
	return glib.Type(c)
}
// GetColumnType() is a wrapper around gtk_tree_model_get_column_type().