I have invoke UIPanel.Refresh() manual. But the UIRoot does not start, so the window looks like very big instant, and then the window would change normal on next frame!
Because of that the UIRoot run after the UIPanel.
If I don't invoke the UIPanel.Refresh, the UIRoot will run after the UIPanel.
If i don't invoke UIPanel.Refresh, the UIRoot will run before the UIPanel.
So the method maybe cause such as contradiction!
How to reslove the probleam ?