cross-tab question

I want to paint in black the backround of a DB cross-tab cell, the cell value don't exist.
I don't mean the filed is null, but don'exist.
An example to undestand the problem:

registro | parametro
1 1
1 2
1 3
2 2
2 3

If create the cross tab, regitro 1 + parametro 1 don'exit, and i wont to hilight in black.

Who can help me?

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