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P3D v4 [ Solved ] Ground poly from 3ds Max use Ground poly Wizard Disappear at edge of sceen

Here is my little project of VTCL Lampang airport Thailand.
Now I working on ground poly, I model it from 3ds Max and export it as .X and then use MCX ground polygon wizard covert it to .BGL
Here is my video

any ideas?
I am not sure either. You need to make sure that the ground is even by checking the elevation.
Make sure that you have a flatten for the airport that is big enough and not only covers the outskirts of the airport but also the rectangles ( running from straight north to straight south) that the ground poly boundary box dimensions cover.
I found a way ^____^

The solution come at the end of post.

Now my ground poly is quite small, I think when camera pan away it's get excluded by render engine. Not sure it's called "Culling object" or something.
In my case, I think because the boundary of my GP so small, it's get offload before it's really out of the view.
What I done is create 4 small polygon like 0.1x0.1m and move it's away from main GP (in the same model), to it's four corner like 500m or so.
This make GP boundary bigger so it not get offload too early.
now it's all good.