Moving towards Application thing and reactivity.

metas/inner.go

@@ -51,3 +51,8 @@ func (it *InnerItems) BuildChilds(parent *js.Object) {
 func (it *InnerItems) initializeInnerItems() {
 	it.innerItems = make([]Buildable, 0)
 }
+
+// InnerItemsCount returns child items count.
+func (it *InnerItems) InnerItemsCount() int {
+	return len(it.innerItems)
+}