Making setVisible(false) layers?

Hi to everyone:

I am trying to make the layers no visible when I want. I am making this
code:

MapRequestHandler map;

.....

Layer lyrMine[] = map.getLayers();
lyrMine[4].setVisible(false);
lyrMine[4].repaint();

But this code is no taking effect. Am I forgetting something?? What else
should I do??

Thanks in advance for your help.

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