Graphics, Figures & Tables ⇒ Missing borders in table (LyX)

[ArCiGo12]

Hi, I'm new in this (using LaTeX and LyX) and I doing some tables in LyX.

My table looks like this:


(http://postimg.org/image/540fa6lf5/)

In the first column I put the instruction

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\cellcolor{lightgray}
\cellcolor{lightgray}\multirow{-2}*{2} %where the 2 is the text

And in the next columns, in the respective cells, I put

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\cellcolor{lightgray}NO-ACO %for example

I thought it was problem of the PDF viewer, but I printed the table and the border cells doesn't appeared.

I'll appreciate any help. Thanks!