【UIPanel's question】Add or use UIPanel In Right way？

[FrankYan]

I have many "UIPanel or UIWindow" in my Scene.such as UILevelPanel ,UIFriendPanel ,UIDialogPanel ,UIMatchingPanel and so on.

I like to Add UIPanel to each of them for controlling their depth.I do not know this is a wrong way to use UIPanel?

1.Less usage of UIPanel in scene will enhance the performance?
2.When should we add UIPanel script to a GameObject?
3.If I have many UIWindows in scene ,How to controll their depth when they are all in the scene?


Forgiving my poor english.

[ArenMook]

Simple rule of thumb is 1 panel per window.