gtk/gtk.go
func (v *Notebook) SetTabLabelText(child IWidget, tabText string) {
	cstr := C.CString(tabText)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_notebook_set_tab_label_text(v.native(), child.toWidget(),
		(*C.gchar)(cstr))
}
func (v *Notebook) SetTabLabelText(child IWidget, tabText string) {
	cstr := C.CString(tabText)
	defer C.free(unsafe.Pointer(cstr))
	C.gtk_notebook_set_tab_label_text(v.native(), child.toWidget(),
		(*C.gchar)(cstr))
}
// SetTabLabelText() is a wrapper around gtk_notebook_set_tab_label_text().