Changed 'Tabbable/Focusable' logic to use Active

wdgt_top_menu_layout.go

@@ -160,11 +160,12 @@ func (w *TopMenuLayout) Draw(screen tcell.Screen) {
 
 func (w *TopMenuLayout) SetStyle(s tcell.Style) { w.style = s }
 func (w *TopMenuLayout) Active() bool           { return w.active }
-func (w *TopMenuLayout) SetActive(a bool) {
+func (w *TopMenuLayout) SetActive(a bool) bool {
 	w.active = a
 	if w.widget != nil {
 		w.widget.SetActive(a)
 	}
+	return w.active
 }
 func (w *TopMenuLayout) Visible() bool       { return w.visible }
 func (w *TopMenuLayout) SetVisible(a bool)   { w.visible = a }