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How to know plane recognized or not in vuforia 7 ground reco

Hello Everyone.  I am working on a project that use vuforia ground. Firstly i place the model a surface, then I change surface the model move with camera. But after couple of seconds the new surface detected and replaced model look okey and don't move with camera. How to know the surface is detected or not, because indicator is always visible? I searched many forum but could not get any solution. Do you have any idea ?  Sorry my bad english, I hope I could  tell you my problem