GUITexture won't active after deactivated unity3d

I have a problem with the GUITexture. I used .active rather than .enabled because when I switch the camera while the GUITexture is on screen, it will still displayed even I have switched the camera. But when I inactive it .active = false; and want to activate again .active = true, it did not have any effect (the GUITexture remains inactive). How would I active it again after inactive?

Here is the some screenshots:



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GUITexture won't active after deactivated unity3d