Problem with alpha blending..

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I have some problem with vertex alpha:
I copy the surface (vertex position , normal, color and alpha too)
I paint one surface with a texture, and bring the vertex alpha to 0.3 of the first texture.

When i use entityfx 32 (force alpha blending) my mesh become in some part "invisible".. Did i wrong something? Now i don't have the code maybe tomorrow i can show you if need it.

And after the alpha declaration i reset all the vertex of the original mesh at aplha 1.
Need i to get a little bit down the surface i created?
I just copy in the same position..
Sorry is the first time i do it!

Aza