How to create a isolated component EAGLE?

Hi. I have created a PCB design where I will use a Shield soldered in PCB… the problem is that the EAGLE have created wires below the shield and this could result in a problem.

What I would like is create a isolated area, where Eagle would not draw any wire… or vias…

Any Idea?
tks

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hi!! I hava created a retangle etc and didn't work.. how?

Could you explain please?

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