thanks THX1138 for replay. but the problem is not about the curve. about the imageplane . in default view normaly in side-top-front view imageplane is behind the grid , but what happend to me, now imageplane is before the grid, so it is to hard see the grid. I don,t know how happend.
so look at the picture (my imageplane) and see what i.m talking about. forget about the curve. please look at it and see what can you tell me about it.please anyone know something say something. that is very weird problm. maybe one day happend to you.