Firing OnEnable when we switch the ActiveView

Author: StanleyGoldman

src/UnityExtension/Assets/Editor/GitHub.Unity/UI/PopupWindow.cs

@@ -88,6 +88,7 @@ private void OpenInternal(PopupViewType popupViewType, Action<bool> onClose)
             }
 
             ActiveViewType = popupViewType;
+            ActiveView.OnEnable();
             titleContent = new GUIContent(ActiveView.Title, Styles.SmallLogo);
             Show();
         }