Brushing selects all data

I'm trying to get used to the data linking and brushing feature, and it does not seem to be working right for me. I have tried searching extensively, but it looks like this is a rare problem. Anyway, here is my code:

data = 0:10:100;
data = [data; data+15];
data = [data; 120-data(1,:)];

figure;
subplot(1,2,1);
plot(data(1,:), data(2,:), '+', 'XDataSource','data(1,:)','YDataSource','data(2,:)');
subplot(1,2,2);
plot(data(1,:), data(3,:), '+', 'XDataSource','data(1,:)','YDataSource','data(3,:)');
linkdata;
brush;

The problem is that when I go to select any data point, all data points in both plots are instantly highlighted. Does anyone know what the problem could be?

Thanks.